Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dadff24e802df0f…

MALICIOUS

PDF

91.3 KB Created: 2021-04-27 11:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b7bb24788fe2c0355bbc0871c2afa783 SHA-1: ec6ce3298b5984d12a74c8fe2dde1a98a4e77172 SHA-256: 9dadff24e802df0f16960db8e04897e0b213b867606b93efc0926284ae66c824
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'West Bend bread machine recipe book'. The presence of multiple external links, some on disposable hosting, indicates a link farm designed to distribute traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=west+bend+bread+machine+recipe+book In PDF document text
    • https://cdn.sqhk.co/rotonoba/6IdqBid/flippy_knife_apk_para_hilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/lasetipulos/idgjGMK/sahara_bird_tap_to_fly_mavic_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/ibvpaIH/xurexerisesexadulejogokeb.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/Yjbgjii/dimerewegosemadepimeba.pdfIn PDF document text
    • http://medicalpracticementor.com/vaduxizatajevarajuq7thj.pdfIn PDF document text
    • http://summerita.fun/7178710790594d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb47e464-af1b-4cd5-aef5-ed66d07a5c39/masumejir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027a4b57-e76c-464f-9241-099d235e9e1c/47357876943.pdfIn PDF document text
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_b24b6bb00c134019ba2cebdd0a7c6f5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6056455-07bc-4366-b5d7-1339dabd8b04/based_on_the_information_in_the_passage_what_do_all_ecosystems_have_in_common.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_ed52644b460141b08985a7124c3e618e.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_17ea71b513834ec898a6d219552e0311.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_487ad0fb7a1a4b4dbd7c96435b81cfba.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_3a1e842195d345e0a157196ec3d4b411.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4a4229-a37e-49f2-acfe-91a904c0f4b8/what_is_another_word_for_retained_earnings.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_bedd463a26774f53a93bc3d04bd9bd5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/3135540421.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/internet_manager_full_bagas31.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_d30a0eb08c094717a645fbec02a5544d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/place_value_system_meaning_in_hindi.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_53945b3f0a4d4f01818958bbac2abf26.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_285c5684e4c24c63918d78d091162fcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/dizadiru.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_f7496f72a2274c268c015d418803e339.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000142f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142F7 18368 bytes
SHA-256: b58b9fa2166b73872c0d57bd694597808060dc598cb4daa298f20a17bb2ccfa0
font_00_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 5500 bytes
SHA-256: 1eb40a844a5c638a98e6986dcafb362ffc154b3d080a466836e764faa04af328
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 11520 bytes
SHA-256: 11506413f66446781185532a7aa215b34562a30ff9226cc0e9118ecbba795336

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