Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6f2c4d0cb79c60…

MALICIOUS

PDF

90.6 KB Created: 2021-03-15 22:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4f2f7e970be4c7c80d6611760ea7a7a0 SHA-1: 26ce6f640ce8cfc380cba420e89d9e1110211f87 SHA-256: de6f2c4d0cb79c601eb3fb7d51d8894ad607da39d1eaea211de4da637dbe7ef3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially malicious external 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://maypoin.ru/wix?keyword=nba+2k20+soundtrack+mod PDF link annotation
    • https://cdn.sqhk.co/doxowite/f3ggicA/water_theme_parks_near_memphis_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/ijWjjh4/rock_climbing_walls_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fff5f6825a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fd18143da37c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472760/normal_5fdff8ed7a33c.pdfIn PDF document text
    • https://fadirepux.weebly.com/uploads/1/3/1/4/131438814/6136543.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/3PiehdR/temple_run_2_game_install_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/DihIoij/3577348053.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/jcPVajh/66991861510.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/cIO0ic7/tower_defense_crush_hacked_games.pdfIn PDF document text
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/349e36264d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_602535746e627.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/cZgdgd1/12097564639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_6f02b378bf66492da1ea7da5f52aa22c.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_5adf5968262c4d8e9aac347def56854d.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_848ee08eeb004e97b73bfdb7b05986d5.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_79c06babf8d54bf6b78185522059f76f.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_91a13ed5fef848d6a518972af8bb77bf.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_3b14e7893c364f6e818e86e829a9437a.pdf?index=trueIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_fc82b05aec5d49beab3a14963cf07b7b.pdf?index=trueIn 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_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 5500 bytes
SHA-256: 60173fc090a7d26da18fc9606375d656a8715f269e24fd6716889ff6486e6b7f
font_01_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 12224 bytes
SHA-256: bca363026c2013d55aa1d0f3965ab107a59ba3bd7a332fd9581ea34e3e74b5d0