Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6bdb6930de9f62…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 11:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a69f0921f9a9715ddbd0378e83e0cb4e SHA-1: 96f19fb9588cbe55a20330951f828c227d48d083 SHA-256: 8d6bdb6930de9f6224ac77ce616c6bfb3921ba51e6baaca472cd2dfc8455b5f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://nipisod.ru/wb?keyword=what%20jobs%20can%20you%20get%20with%20an%20occupational%20health%20and%20safety%20diploma PDF link annotation
    • http://lnstagram-badge-verification.com/venojazanozenafi35j5t.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/eMifojf/84621127000.pdfIn PDF document text
    • https://fobamenowukar.weebly.com/uploads/1/3/4/4/134485242/8699146.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/hfwiihu/tazazud.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/ghHgiie/twitter_logo_font_free.pdfIn PDF document text
    • http://qwonder.space/alzheimer_disease_review_article_2018okkvt.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/Dge9hig/android_auto_vlc_video_abspielen.pdfIn PDF document text
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/4418176.pdfIn PDF document text
    • http://pomulagija.iblogger.org/compressed_mask_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepaxilex.epizy.com/milek.pdfIn PDF document text
    • http://lufadavebu.epizy.com/dunujadabuxivifelura.pdfIn PDF document text
    • http://walefusariwe.epizy.com/healthy_food_guide_chocolate_caramel_slice.pdfIn PDF document text
    • http://mowiredeponup.rf.gd/how_difficult_is_the_hike_to_the_wave.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/rekujavotalesixilojasile.pdfIn PDF document text
    • http://nawevepumag.rf.gd/51047936627.pdfIn PDF document text
    • http://nogamijabuwemi.rf.gd/runescape_dwarf_cannon_range_training_guide.pdfIn PDF document text
    • http://pasazaxara.rf.gd/color_teaching_worksheets.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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 5896 bytes
SHA-256: 7128191d5e529087762bac89631a2ec97168cc41508a34077ba7d59830be39e5
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 11028 bytes
SHA-256: d2b6cbc42ce3bb12f0e70586c1ebfa4a4add787766a037b4a7d4b6f1be2278d6

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