Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb8dce800c95e30…

MALICIOUS

PDF

70.6 KB Created: 2021-02-03 15:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: caa6cb9f17619f549a2324d249579be9 SHA-1: 2edd39531310d3460324cf3c4e743509233651f0 SHA-256: 9cb8dce800c95e306eec87ecc15c51a9c6d1f545c97b1d7e22e736df3f257f87
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=solutions+crossword+answers+chemistry PDF link annotation
    • https://beteviduzil.weebly.com/uploads/1/3/3/9/133986260/4112016.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/ec3f18a5.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/jgjT1p7/fallout_shelter_special_for_exploring.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_60194c2e3bf83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fea03c69cdeb.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/idgdhhK/old_phone_ringtones_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_600e9cddaedc0.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/XICjiJR/famivezanovewepokogawub.pdfIn PDF document text
    • https://fedijukesubi.weebly.com/uploads/1/3/4/6/134600597/pitivosebij-totovuboj-neziziwoporagot-wojefanap.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/d2XOQ0g/aerox_3_wired.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/aLJHida/sandwich_places_near_me_with_gluten_free_bread.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_600979f53fe88.pdfIn PDF document text
    • http://nugidaga.22web.org/breezer_vivid_shuffle_video.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/2705208.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/gcigTii/werewolf_3d_model_free.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/jujadodedaruxix/32890887605.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/wusexarevigoxosasibeso.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/sagoxepijeriroxobow.pdfIn PDF document text
    • http://mezexefobotero.epizy.com/chinese_new_year_sales.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/memelup.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/43198446075.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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 5476 bytes
SHA-256: 5e901a61153bb95ce58e422a977b421a3e98d8fbabca6525b58a867ecdee6cb7
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 9576 bytes
SHA-256: 2dd83a3bee3e9de99fb8391f7ff2304f9017488a88b7bb65e17763ac0f5dbe00

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