Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6db8b6512bbee9…

MALICIOUS

PDF

78.3 KB Created: 2021-03-03 15:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ea97c4f97c62ccfaed826e1ab0fa5eca SHA-1: c8610528179315a1b1fc608a604ee87fac5b3d09 SHA-256: 3f6db8b6512bbee915170cd951c1ea3009078cbef0bb23a8001b3e7044e83b54
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the primary links points to zajinet.ru, which is likely part of a phishing or scam campaign.

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://zajinet.ru/award?keyword=where+is+the+best+place+to+buy+a+weber+grill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481830/normal_602c4872d431b.pdfIn PDF document text
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/1688806.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/1e23f31215d.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/ranosavabixiwof.pdfIn PDF document text
    • http://bazis-rostov.com/holmes_tower_fan_htf3409ar_manualt6m9j.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/wabugobeviguliruwijezubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_60092d15c9e44.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/bapixubo.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/1668496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5ffe10cb63ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/ifhdjyi/patchwork_the_game_for_free.pdfIn PDF document text
    • https://talasawag.weebly.com/uploads/1/3/4/2/134265385/setigafane.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/gegabimetovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizuzol.onlinewebshop.net/why_is_my_fire_alarm_beeping_three_times.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/how_to_reset_jabra_headset.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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5540 bytes
SHA-256: e36456e254ead8717d6459bfcf2e09777a847e1f7c8203a680a05486dbd6e996
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10232 bytes
SHA-256: 916a017bfcc53a791aec37711b9ed6d09a0c128fe6bdb558fae21aaa8d37d032

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