Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5b41ea10017e5e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-24 13:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bc1989145e2263d85c2da4e3324d09d9 SHA-1: 5f557aa1ea224483f33446909625b597fb8f76e0 SHA-256: 6b5b41ea10017e5e996f7a8cb86204d19501f7f31c89922f639da6b6ee3ff4db
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The embedded URL 'https://zajinet.ru/strik?utm_term=lunchtime+results+2020+predictions' is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=lunchtime+results+2020+predictions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fd224e8a9c3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fed3e2bb2f43.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/fipiwekejelux_tozelar.pdfIn PDF document text
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/sapawoviga.pdfIn PDF document text
    • https://lapumutugafi.weebly.com/uploads/1/3/4/6/134601317/borivaso-pujodito-xinepinatuxigu.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/2038008.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91993ace-cc51-4cbb-ad9a-494f629dd0b3/definicion_pensamiento_critico_segun_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ba5593-9da4-4be9-a255-249494475b4a/razor_scooter_e200_vs_e300.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/las_vegas_club_performers_this_weekend.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/good_omens_season_1_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/16741087366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0c0e35-68da-42aa-9bb4-c09efdf5afe5/37505955835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cf98b1-eaa0-473a-bc84-57f2627eb20c/37653702305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602127fe-3082-4ca4-a234-cfc2146dc467/9541514325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d84582-3814-414c-bd05-eeb9a34a6905/83108397772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366b14cb-fefe-4a25-8298-4be5221bd009/fesosevabazutepidafuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d354a2-883f-4b0f-b9ce-b0a7efaa7080/bivopodexavosupatome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7332abbb-05aa-4ad2-999f-ad1565b30961/is_capitalized_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797378da-ef1f-4ac1-8394-0ccfbfff2909/how_to_replace_record_needle_crosley.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/kms_activator_office_2013_professional_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24096b3-c8cc-4275-bdae-340bb7363d4a/gofego.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/64422109734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67366dc-545b-404f-8744-3708cf681640/44472717537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c54207a-40a7-4fe1-94c3-5c5db746ac46/what_does_spectre_mean_on_a_cobra_radar_detector.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_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5320 bytes
SHA-256: f36a49d181f8a5656093f18fe2336b8fc234054ab772bb0dae84ca445319f029
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10956 bytes
SHA-256: 6fc4d8f936092a15259d802719b1003c64e530a40585efc1272abac44bd49472

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