Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cc295bc1f3af0a…

MALICIOUS

PDF

71.1 KB Created: 2020-11-25 10:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3f453a65c712335b47de2de4e3bfdec8 SHA-1: c296d3aeaa1cd8b7c978436995485ddc2790ec9c SHA-256: b7cc295bc1f3af0aa0b94e359e2db595b2dd746bc4f6053806f612f907287dac
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one specifically identified as leading to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, potentially related to a schedule, to drive users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/strik?utm_term=jumbo+shrimp+home+schedule+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fa4ee355a012.pdfIn PDF document text
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/jobizikaded.pdfIn PDF document text
    • https://gaxirakim.weebly.com/uploads/1/3/4/6/134605205/wolizebozuxivaku.pdfIn PDF document text
    • https://jobozisibipiw.weebly.com/uploads/1/3/4/5/134581899/gutudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_5fbcea6ade552.pdfIn PDF document text
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/fiforirolepur_lovixavagemigi_rolepemavowab.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/lerexa.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/wararalutivim_xubob_tinoripajolisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/893f78ed-5c33-47a8-a08c-640a917910bd/najavitogaxediwuneteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb23fb8-ff48-477b-b8a7-ef0a60afcc15/extreme_car_driving_simulator_hack_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11d049b-5bd3-4254-a6bb-3dd782594d47/46956556787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21e3c32-2bb5-432e-bdb3-681d3006bd5b/comme_des_garons_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/seminijaju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 5412 bytes
SHA-256: 5f660b24bd171a19ef6bc708b998b7ac07e4025d7ddcf536ba7c908ff6a656a2
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 11976 bytes
SHA-256: a0af9ec3834ae28c666f9bc842b9f9986e92c9653c47500bbc6ec74efd4b51b5
font_02_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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