Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bb7d674c1c7d52…

MALICIOUS

PDF

80.4 KB Created: 2021-04-02 12:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 68df672e9ca8a593afce433c13eb016d SHA-1: 212418c5ed85b35db05967a3f9f167d8d5568aef SHA-256: 40bb7d674c1c7d52d0cd780ae469e226d1a4358e2ad1bf7f51c9292bd33560ce
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to suspicious domains, indicating an attempt to redirect the user to a malicious site. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is part of a link farm designed for malicious purposes. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=rationalize+the+denominator+practice+problems+pdf PDF link annotation
    • http://center-about.com/when_is_ps5_coming_out_in_canadacc6bc.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/dnetigg/ifetch_too_interactive_ball_launcher.pdfIn PDF document text
    • http://pribor-poverka.site/36827368282i15ob.pdfIn PDF document text
    • http://kasumunanivux.iblogger.org/android_x86_64_stuck.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/hahfXhg/between_the_lines_movie_2017.pdfIn PDF document text
    • http://walkover.me/what_boy_names_start_with_bu5mx0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_600f9dbb871c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_603cba27e182e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_60170d96c23e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujuletabekomus.rf.gd/49278283978.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_59371255a59e42a397bb48f8ff688e63.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_9c8c03a056234bee82f53841141bf770.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1c09b1-d3d6-45d8-a538-68f723a1ef6b/mutigidivazalakadax.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/60097731363.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_e06f29abbc434922bcf4dc6d88cd3b0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8392909f-da50-4fae-a15f-25dddde3b498/maytag_bravos_mct_washer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ce7bc7-d4af-4820-b02a-8c4e87f89903/zuzalitu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 5592 bytes
SHA-256: b9b36e0100fb62e78b27a8a2df87abf40459488fe7c0be69320269838db48f0f
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 11444 bytes
SHA-256: b5510797ab4312e5c7411e639ba9edee9ee17f814caedea02633cd7d1b127da8
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16124 bytes
SHA-256: 166d8095639d8cfde79b65650ac0babb7b206b09bf96dfcba61b974d763b9739

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