Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaddc5f87420863…

MALICIOUS

PDF

84.0 KB Created: 2021-03-28 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d7a966c25c1c2b5e1a60665b36ecd58a SHA-1: 4f7bcd9a55e5b442f6011904d290d9c4bb2ad44f SHA-256: dfaddc5f874208639838511b2db7a58d9e1f61f0ebbf9940e00d2fef5140ad32
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://kuzutuzo.ru/123?utm_term=american+truck+simulator+patch PDF link annotation
    • https://cdn.sqhk.co/fafujedajir/dKuB9JX/skins_season_5_cast_franky.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/zhchige/sipol.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/richgEW/99505913337.pdfIn PDF document text
    • http://cleaner360.shop/lewoxipavozuvugim9th2.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/poxigulamadipuwapeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/ib8higi/classic_n64_emulator_games_apk.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/d9f7eda0a2bd.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/7806718.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/gjdQGm1/zopamokazuloba.pdfIn PDF document text
    • https://kokobeze.weebly.com/uploads/1/3/4/6/134605009/3727747.pdfIn PDF document text
    • http://krepezh.guru/foluvenekifudr8flb.pdfIn PDF document text
    • https://momekefu.weebly.com/uploads/1/3/4/8/134850451/dutavadanu_nakalim_jixenezanamu_nitavo.pdfIn PDF document text
    • https://bosopezimewuzur.weebly.com/uploads/1/3/4/3/134313362/6454490.pdfIn PDF document text
    • http://fortuneo.biz/dewoznm0gn.pdfIn PDF document text
    • http://hookup157.site/jotozuxevebibafubevemetidsh5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_07aaf49858b54935b08595e541bd6789.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_327b065b8f7d4c76ab56bb80d94f8bfb.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_a8a8b947ef6b4021b0994bc4c021418e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd1650a-72a1-4089-ba18-04fd17f3d93f/angelcare_baby_bath_tub_pink.pdfIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_a1f643eae2684b60b56b3c8966d7263a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/258f4d9d-5406-4b0b-9f8e-3b430d543aab/star_trek_voyager_cast_season_5_episode_13.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_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 5224 bytes
SHA-256: 1b5c11565ee47938585782ccb422fce782a1bc1a38b842e621e6698b70ac64db
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 11032 bytes
SHA-256: 0cb345ed8ac587521d9c20cddb19a918bc9d89382968a1032c188b75ff8ea369