Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad562c012e0767d3…

MALICIOUS

PDF

74.8 KB Created: 2021-03-15 10:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce64b87887ec7ce6e804131fab998b12 SHA-1: eb369a955df7b8901d6ea3b5eb62a92132c94425 SHA-256: ad562c012e0767d31fc1e43907ca1a209e3caeaf2c149ad55992d627106d1217
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's part of a larger attack chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=baudolino+pdf+indir
    • https://cdn-cms.f-static.net/uploads/4446511/normal_603f0607ef5c1.pdf
    • https://cdn.sqhk.co/tuvuderasaza/k56ibgd/road_rash_3d_ps1_iso.pdf
    • https://cdn.sqhk.co/tibakekavero/Wjjif5F/digestive_system_organs_and_tissues.pdf
    • https://cdn.sqhk.co/sepovili/2fQhhid/dorumulumax.pdf
    • https://static.s123-cdn-static.com/uploads/4417045/normal_6008c57bc992e.pdf
    • http://tuduvodakep.mypressonline.com/rekovajap.pdf
    • https://cdn.sqhk.co/bijininabex/Cibjajg/62897184687.pdf
    • https://cdn.sqhk.co/lesebonun/g5heaaX/duck_shooting_hours_wisconsin.pdf
    • https://cdn-cms.f-static.net/uploads/4464529/normal_6038b3f52b5b1.pdf
    • https://static.s123-cdn-static.com/uploads/4461484/normal_60057afb40573.pdf
    • http://bamefidev.mygamesonline.org/attack_on_titan_manga_ending_theory.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be6d6b98-ff3d-461a-8812-c4816d417b05/what_is_intellectual_property_law_in_south_africa.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_93afa38a8e884438926597592b111383.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a015e318-9fb3-4d13-951b-f37a23e1c7cb/what_if_movie_marvel.pdf
    • https://uploads.strikinglycdn.com/files/f1f761e4-446c-443f-a984-3e7910170d3c/what_is_the_best_way_to_learn_carpentry.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_580c93bb6da14c088c6882959a8cff11.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_off0000e533.bin
44e3f3eb544fe6ec0cb66c3356adcc051864008358807e5786ff9ac62798b9b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 4908 bytes
font_01_sfnt_off0000f5f5.bin
2a095e2cef1db74d74f4da2935df582442dec83c57b0d7066c32951004956a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 12356 bytes

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