Malicious PDF — malware analysis report

Static analysis result for SHA-256 239647c83cb0ab97…

MALICIOUS

PDF

82.4 KB Created: 2021-01-20 01:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a2e32a2748c9ee4ab180d1e66de3f21 SHA-1: 8a3263c2d72671f9d1b5a14e3005fd1de9ba0a42 SHA-256: 239647c83cb0ab9713ebd4a2a8ae3fd3e046977e53722ce043b869ef9fcb6fd1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=garmin+gps+with+backup+camera+capability PDF link annotation
    • https://bololadagulit.weebly.com/uploads/1/3/5/3/135348095/ruzanemi_reruzedofozulon_botogimatav_lesej.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/busababomenizoserigufamo.pdfIn PDF document text
    • https://ronitodusod.weebly.com/uploads/1/3/1/3/131380212/aafc6cb.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/66580852010.pdfIn PDF document text
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/e5977464.pdfIn PDF document text
    • https://site-1177746.mozfiles.com/files/1177746/autocratic_leadership_style_advantages_and_disadvantages.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/zupisujolifozefegazo.pdfIn PDF document text
    • https://site-1216802.mozfiles.com/files/1216802/muwujagifuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5ff1f66fe518f.pdfIn PDF document text
    • https://site-1168242.mozfiles.com/files/1168242/download_game_poker_offline_online_mod_apk.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/towezujexukokuvakuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f51249323.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/zemigiduwagafu/medubikina.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_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 5776 bytes
SHA-256: 594fcc35e92cc4c3511d36b19cfaeff6299584aec52901dad3592cac6570a510
font_01_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 10680 bytes
SHA-256: 116da4e3f744d8b4e665ce6aa6514bd0e3468bdf699aec05b4e9c3d3b3231bb8

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