Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80680e54d4fa0b8…

MALICIOUS

PDF

80.0 KB Created: 2021-05-29 23:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0b6d6e41bef356b6b7ac397b5f9df35e SHA-1: 5bee4c7e7d5e4d6d51fa248fa99c3f4e21f6812d SHA-256: c80680e54d4fa0b83b754af7569fd6c01b5484404408fed0dc8f03dce3d7f829
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for malware distribution or phishing.

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
  • 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://fokemale.ru/123?utm_term=coho+fishing+reports+puget+sound PDF link annotation
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/da8a3bbf56.pdfIn PDF document text
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/sodanegodibadeb_libijesab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_6035373d4ebd2.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/bf7df39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601d9d3858c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fdba95a82910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_60206e097ddfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_5fdbfb4d20451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475739/normal_600777654303b.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/fezozitexigo_gigalija_kubekadosoga_wepaviko.pdfIn PDF document text
    • https://varodapomibaga.weebly.com/uploads/1/3/4/8/134874415/tikifositofiju_wojokezunug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602e20b0dac18.pdfIn PDF document text
    • https://dimulawi.weebly.com/uploads/1/3/4/3/134380670/wuxibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5feaf3249e16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_60222f4342d8f.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/b77a592d.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/tonevaxex-dufifovaja.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/59fd3a71-0c57-4d65-9268-5be5b79d455b/gukoterenubomoropakozovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94243d72-27a8-40c6-b1d5-e489b6441d1c/borges_the_aleph_and_other_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451cfea7-965f-4d0f-8133-82f460e6394f/eats_roots_shoots_and_leaves_joke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18863ac4-1ec1-4a27-9113-c0f20f0d7b3e/craftsman_25cc_gas_blower_parts.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_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 4968 bytes
SHA-256: 96a3b79b3034c43c9e56134c187bfec74df25fcdb0307ee847fc976d6ce59deb
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 11288 bytes
SHA-256: a37fa00cf4f516c602ed76c0b9cef3932000d6dc1d4abd86601fd0373bd55b24