Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7e7e2bee0d5ba2…

MALICIOUS

PDF

84.5 KB Created: 2021-03-23 08:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f702825cf13ee25fdec296a25767c483 SHA-1: ab938915abc6e0fc6ba79489a033199477e055f4 SHA-256: 8f7e7e2bee0d5ba23b95e361e44a3cdc20358764127a4bb124fcd1010060f8ff
186 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, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/123?utm_term=consumer+reports+truck+tires+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389080/normal_60020031e6853.pdfIn PDF document text
    • https://komiwego.weebly.com/uploads/1/3/2/6/132695384/nizunixazemipaj-panibotiperem.pdfIn PDF document text
    • https://duwafozadujazak.weebly.com/uploads/1/3/1/3/131380008/dabonotiratokew.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/teparujelonegoxamus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_601959ffa8a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_603b4dfa39d03.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/sodebafabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_6006790e5b6de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_6021843c46763.pdfIn PDF document text
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/lomuma_kawubazinaw_nimok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476590/normal_60063ced7b56a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fc75ccb5b9e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467581/normal_60061eff91cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_603af10265811.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/makomipizireloji.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/jivamubug/65135842353.pdfIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_bf7b452983484638869971825ebb9f15.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_d4e1f406b0d643308a330cddfdbdc1d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/textbook_layout_template_indesign.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_c8540e5165e54bb8bcd0d793853c9d3b.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_f18990c179454be59c626f29c7e41792.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/pokujiwiwevazavalowodev.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_edc258fad622431e820f5dbd385e42ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/maths_puzzles_with_answers_for_class_4.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_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 5324 bytes
SHA-256: b5499a640941ac2993fb626ea3b5b197768fe001f2513ac15d8a46e7a9b36b60
font_01_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 11156 bytes
SHA-256: bc017d0376222bbc62cf60fbee72712367e8790b378ec7e4a2e2fa2339aabbf2

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