Malicious PDF — malware analysis report

Static analysis result for SHA-256 9613c9073cbbe3b8…

MALICIOUS

PDF

71.7 KB Created: 2021-02-08 18:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10991e0498e838f985b057ae40a3db67 SHA-1: e66d2a45085e83590d8a7a45898f9e5c9f00fd61 SHA-256: 9613c9073cbbe3b84f3c77fa5311cbcee83524dcb3074c4fb6fef02590c91d23
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating a link farm and potential phishing activity. The document contains numerous external links, many hosted on disposable domains or subdomains, suggesting an attempt to direct users to malicious or spam content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/123?utm_term=skills+shortage+economics+definition PDF link annotation
    • https://cdn.sqhk.co/zavoragive/hhnBTce/renojipireribanoluretabiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/AOgf1ia/40144866920.pdfIn PDF document text
    • http://noxivivixuza.22web.org/answer_and_cross_complaint_sample_california.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/hrD7Uhb/wrecking_ball_miley_cyrus_ukulele_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuwune/hepygfP/download_game_mod_dawn_of_steel.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/gOtihid/on_my_own_les_miserables_korean_lyrics.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/lulogirarekusezem.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/6Xthb2e/dog_lighted_tabletop_christmas_tree_decoration.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/caDicqX/furreal_friends_starlily_my_magical_unicorn_pet.pdfIn PDF document text
    • https://kavusataru.weebly.com/uploads/1/3/5/3/135314949/dapiwegefifuwa-pixesaturab-reluke.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/jiqErha/japugetifo.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/681024.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/ea983f.pdfIn PDF document text
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/fadikojepizexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toguvaju/wekowesejosonozazitovok.pdfIn PDF document text
    • http://fadifisevak.epizy.com/13845064101.pdfIn PDF document text
    • http://silinodev.rf.gd/14145317199.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/analyzing_and_interpreting_literature_clep_study_guide.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 5600 bytes
SHA-256: b77cf40ff820d6647cf6275922ccb44f247aa24cdd339353f235614aaff085f1
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10544 bytes
SHA-256: 281cb7c26ce6fa8a240a2bc5be27235df7cf38003dc63b2376df34ee49d4c521

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