Malicious PDF — malware analysis report

Static analysis result for SHA-256 116a58194bbbe27c…

MALICIOUS

PDF

72.0 KB Created: 2021-06-07 17:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 417e204cab25de2ae6bbf0f869be54e0 SHA-1: ec693487a84b235b0211f74548258dd599cc2558 SHA-256: 116a58194bbbe27c3b34c743611b027656fe8743e7cf090f89cf5b852a3fc93f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, likely for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and the link farm structure strongly suggest an attempt to lure users to malicious sites or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/pbw?utm_term=easy+and+free+video+star+tutorial PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366321/normal_6005cd2ad8faa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5ff13ff7d5ba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_6000fee55c208.pdfIn PDF document text
    • https://kekiwudegabute.weebly.com/uploads/1/3/0/8/130813612/656f0e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6016ca1a60c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5fd18ac113424.pdfIn PDF document text
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/8115029.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/zupexi.pdfIn PDF document text
    • https://ruvazokof.weebly.com/uploads/1/3/4/0/134040659/5693254.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/159c7a536737115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6023cd89cf4b7.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/pevevib_berefenatijute_titopopukemoso_zedugenafomel.pdfIn PDF document text
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/nivob-sokuxaxivok-regogafovuze.pdfIn PDF document text
    • https://vifinijeg.weebly.com/uploads/1/3/4/4/134479412/972fed3c47ee7d.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/namujido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_6026420141dec.pdfIn PDF document text
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/gevukudubenuwetununo.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/66a067b5-a272-45aa-8687-eaf423e48d63/sundance_spa_filter_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf394f6-73f6-41de-a76b-b0f11875c840/24208611130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1683910-dd38-4673-a4e4-e54d984479a4/rolewigikokozebazuzeseti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54315c5f-3664-47a0-bb7e-e55dc436098b/45563719475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4570acea-c4fc-49fa-8c84-9af23da765b6/wugikozudedatuz.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_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 5020 bytes
SHA-256: 4fe169afbe236ec34321206c2ea5eba2908c186abb12271c9ee654ce67201a6f
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 10348 bytes
SHA-256: 086a7ad133755fee2f821f34894cd86c210f8906ecee21d425c98e2caeb24c5d