Malicious PDF — malware analysis report

Static analysis result for SHA-256 5442db8b1721f23a…

MALICIOUS

PDF

79.1 KB Created: 2021-05-22 16:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ab644dc3ec637c28c11a7c2ef1fa5b2c SHA-1: b8e60705e34284b0c784aa15ee318e9a6bee2a75 SHA-256: 5442db8b1721f23a3e67c82aca0c50989218763082b18f22e0f6bc49106f9d22
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8184

Heuristics 5

  • 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
  • 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://druttle.ru/strik?utm_term=what+is+the+biggest+avalanche+ever PDF link annotation
    • https://butabapob.weebly.com/uploads/1/3/4/7/134744569/tufafozejosiged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_603b36e7cc4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_6062f4c79dfbf.pdfIn PDF document text
    • https://wuvatefowid.weebly.com/uploads/1/3/4/4/134470889/worilipix.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/a2cf0a.pdfIn PDF document text
    • https://jaxanawunolat.weebly.com/uploads/1/3/0/7/130739567/xitazuwurapu_nofiruxugeveg.pdfIn PDF document text
    • https://pukibasobudez.weebly.com/uploads/1/3/1/3/131379944/e5a32933b7868c.pdfIn PDF document text
    • https://sutuvawubu.weebly.com/uploads/1/3/6/0/136055635/lesejedovelemof.pdfIn PDF document text
    • https://bokenupipanedi.weebly.com/uploads/1/3/1/4/131483400/245503.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/8882285.pdfIn PDF document text
    • https://golajowedobaxa.weebly.com/uploads/1/3/4/3/134308052/jexetal.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/8545489b-c494-4560-a943-7d847de064e0/why_is_my_tv_antenna_no_longer_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3acdc04-ba21-4579-8c09-806a99e101cd/lesson_5.2_practice_c_geometry_answers_pages_303--309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea061bdb-55d5-465f-b5b9-de8193cadd94/kepidofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df142b8e-cc02-4401-b3e5-4d8c5a33911e/fujapijimededi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687933e8-4235-4017-b7e8-f77f5c7f2bd6/how_to_reset_ps4_gold_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a1f0c7-b1d8-4c98-9e05-e87b047f3c7b/luvasite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93777901-ebc1-449e-a629-3cfa082e59c5/reddit_how_hard_is_ap_language_and_composition.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 5272 bytes
SHA-256: fce10781683485e20e1581708ae439f78ac0c2758a7f9970928704e404e087d1