Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4042eb9e301797…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 01:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 55dc30e65b68d284c36206d475fbe068 SHA-1: 29c64ab2850ef72d1d05c1abbb8974553af46137 SHA-256: bc4042eb9e301797867da4262b35d1f4df5503f5d2bdfb79c441921ea7180ebf
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain. Heuristics indicate a link farm and a callback phishing lure, suggesting the document is designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=can+i+apply+for+food+stamps+online+in+texas PDF link annotation
    • http://divalurumewib.iblogger.org/1481656581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_6031cf223d0ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5ff5697d22b90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_6002ad9b421f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_604df42c807d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_602dee1310110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fefe93001f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_60249e030e289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fd7f441a7888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff8f21deea32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_60082a4656828.pdfIn PDF document text
    • http://jodefugivu.22web.org/sample_medical_school_letter_of_recommendation_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_60083719d58d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_60131404d9b83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409396/normal_5fcb17e87aa5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_600251c229442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_d2e9c30af02249229155bda97ef88d02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/51023236695.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_11cf777618114a13a6ef92ad6eb225db.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_6483052300bf46fc95153d62a41bb79c.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_a2f727eb20b3494c8c8eaa04c3eb7cc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/tekejatugobamubiwewizobob.pdfIn PDF document text
    • http://wiwesokowam.epizy.com/20948631076.pdfIn PDF document text
    • http://sumolusekoximu.rf.gd/98063967163.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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 5260 bytes
SHA-256: 49526cb1427dd7ece3174096536c0eb614b386d9c99946364a6f16a426700d01
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 11132 bytes
SHA-256: a47ac8b2d49eaf64a310c240104f2ff651999b73ac3dda428d600ceaf37f4ab3