Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5ac2bb59219cd…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 21:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40f57864f06dfac5ee01267df95affd0 SHA-1: 11c48e1252ba6f6d4f3b2459ebc00f736341bf43 SHA-256: f8b5ac2bb59219cd8582bee0f895ee4d43a2073db214526277187918dc1d1bec
186 Risk Score

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-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://maypoin.ru/123?utm_term=mod%25C3%25A8le+d%2527+attestation+de+formation+en+anglais PDF link annotation
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/mupuwozabokap.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/gigiePw/super_mario_world_nintendo_switch_cheats.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/7f84aa93c08124.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/MiiribQ/kobol.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/ap_budget_2020_20_sakshi.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/6EohhfB/60425984123.pdfIn PDF document text
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/melep_nekogukas_fasono.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/blanket_chest_plans.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/marketing_plan_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/hjbHPgj/18321970618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_d58a8e3fa1c142d7b357802f31ff99c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/96566395043.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/nih_research_grant_proposal_template.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_76b0f657a3fe407485547eaa2ed70b4c.pdf?index=trueIn PDF document text
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_3bfe409538ef42e69326b468abdefaa3.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_7787eb32b2f8419694a93313e4110e42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/cloudformation_resource_already_exists_in_stack.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/nugebuxilowezibexipetux.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/6975821231.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_243096c3b14d451c829666261dea00ef.pdf?index=trueIn 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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 5408 bytes
SHA-256: 5fd72e4737a269baab36512fb70211439e39398c5f838dc6fc36b095d6bc8bb8
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 11648 bytes
SHA-256: 6729325ac653be6c3cc9d0694da27030b0bede3c8a22024280a904a9128c7f45

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