Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7956d69679759…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 21:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8657bf4915e00d4448212fb7e24beb SHA-1: b121de989253eaaa1a8c577be041ad8b9f25e192 SHA-256: 19b7956d6967975934f74d3efe7ea18da31f4ccd1e3886a40d4cf2dbe9762d0d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a "link farm" by heuristics, suggesting an attempt to direct users to malicious websites. ClamAV detected the file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+is+wishful+thinking
    • http://wowezixuxaxu.22web.org/31043313167.pdf
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6015af8dd6633.pdf
    • https://cdn-cms.f-static.net/uploads/4379387/normal_605d936d6c255.pdf
    • http://kudopifupelixi.22web.org/agriculture_and_rural_development_study_material.pdf
    • https://cdn-cms.f-static.net/uploads/4403140/normal_601eb8ffc04f5.pdf
    • https://cdn-cms.f-static.net/uploads/4393889/normal_602bfa5e365bb.pdf
    • http://jefevivavifax.scienceontheweb.net/clinical_electroencephalography_misra.pdf
    • http://pusatokolerax.mywebcommunity.org/qasidah_imam_busiri.pdf
    • https://cdn-cms.f-static.net/uploads/4459057/normal_604d25f744f7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_ffce5a43f3d54ac6b03297281d265193.pdf?index=true
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_e2135338ffb84681a2e041b4493d8c60.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_05504a341de14d99a0368cf5e42104a3.pdf?index=true
    • http://jurukukixinom.rf.gd/batelasatobokinujarobowa.pdf
    • http://bifiwapaz.onlinewebshop.net/pujofe.pdf
    • http://gowejolu.rf.gd/schizophrenia_guidelines_2018.pdf
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_5aefa607849a4f0f822faf108b5b483a.pdf?index=true
    • http://wilosokanik.myartsonline.com/pazuxu.pdf
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_cd4adef3e7104aee95c45e53837dc003.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_9223a2f4717d43d1bd8466a3ba6ff0a1.pdf?index=true
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_8ddd0f0b42fa4f508d9b5d0ce7666627.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef83.bin
38c2434a7b3f89861a5209b58b65bd7dcd54800a5b6ff132de15a904396531b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 5104 bytes
font_01_sfnt_off000100fe.bin
549668a6fdfd09cca6dadce965804e717b61e9e284fd59d581e7fc962dfa3fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 12116 bytes

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