Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db9b428ebc0d6e1…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 14:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4568d5162151331bda67b5ba843c0b67 SHA-1: cd3c3ec2aec3409451ea5e599a93a5fa22826f2a SHA-256: 8db9b428ebc0d6e132dd52f99ca5ae54402b4b167b0fc317a3f25108d05b42c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/wix?keyword=friends+like+me+chris+webby+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425727/normal_5ff08d2345654.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/Sgjigji/61466255991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5fefa51e1a09e.pdfIn PDF document text
    • http://junemam.22web.org/15622021088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_602b23a2a1275.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/gfF2qje/ant_colony_optimization_project_ppt.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/begijapogoxegetirididufem.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/hjfjclD/capital_fund_management_australia.pdfIn PDF document text
    • http://dasuwupozu.22web.org/81274442563.pdfIn PDF document text
    • http://sibasijiv.22web.org/nine_knowledge_areas_of_project_management_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/Rg5hgih/tinusizibuvuzelob.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/hlihoge/bedotamozidafoxuvinew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_60168c452667a.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/Wc327ig/fake_friend_request_called.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/bsc_biotechnology_subjects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_6019ff168bdfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_7978ef9c578a49cdbaf53c3f2110febf.pdf?index=trueIn PDF document text
    • http://sewevikefusox.epizy.com/jiwefu.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_f159b394a5674a409a2ca8d173328575.pdf?index=trueIn PDF document text
    • http://nupuzawov.onlinewebshop.net/xukisofulusopufuti.pdfIn PDF document text
    • http://sonarubitexo.atwebpages.com/30464776641.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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 5320 bytes
SHA-256: 577b3908aae413c25ce8424c84e105bbf46fe83c47b633e8f1e55d0a68e2ba35
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10412 bytes
SHA-256: 48f22650f36406c446ba4aa15ea5bbe7bd688fe783899cab0344db25e39db502

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