Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc1712db7cf83fc…

MALICIOUS

PDF

68.6 KB Created: 2021-02-19 10:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2626ef009bbe7f0382ccee92010ce28b SHA-1: 9066ec18b8dfff5d471d194d860b2c11ff3fe23a SHA-256: fbc1712db7cf83fce6ac13b61f2315a9c8772edfd1d17d08991b8d432d7773cc
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=polaris+3900+not+working PDF link annotation
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/90563f341eeb.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/7j7ooLm/soul_knight_officer.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/julolosazufix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416512/normal_5ff6a528c2ba0.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/960730.pdfIn PDF document text
    • https://nogisapu.weebly.com/uploads/1/3/1/4/131453993/800509bcf.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/032aa371e1d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_602c7ae132a0e.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/gutefawa.pdfIn PDF document text
    • http://snt-br.ru/susozumomagaziz9vxfj.pdfIn PDF document text
    • http://klokisik.space/debijomirobalagatonilapqfm39.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/tetokuno-vevavumidibazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_601bfd61e4a55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/chatterjee_biochemistry_book_free.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_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 5472 bytes
SHA-256: 682ed121b8673af8a46a95ef3a4417bab597f47f773457343d3f83c5790cf582
font_01_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 10108 bytes
SHA-256: ca5fab7d4dc9b5906a12e1fde5ead7dc4994b14003f953fd29000a8968eb1cb0

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