Malicious PDF — malware analysis report

Static analysis result for SHA-256 e181f175fec5bbc1…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 10:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8259262cf8a8823a211a47d5eee06881 SHA-1: 782c1903c6972a908a45cd6439de654919b529c8 SHA-256: e181f175fec5bbc14bf718e85b204428c0b6f7b931cb465a96410f9b44f8f70a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or download further payloads.

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://botokaw.ru/award?keyword=behold+a+pale+horse+pdf+download+free
    • http://khareedforosh.com/mekesix3y18x.pdf
    • https://cdn-cms.f-static.net/uploads/4451929/normal_602f7a16d315c.pdf
    • http://trysucre.pro/fender_mustang_1_v2_reviewdizpn.pdf
    • http://gaberiwilovu.22web.org/gastroenterology_clinical_cases.pdf
    • https://cdn-cms.f-static.net/uploads/4489843/normal_5fd6a0a5d60f1.pdf
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6007babbbc6cd.pdf
    • https://cdn-cms.f-static.net/uploads/4393785/normal_603372b7beece.pdf
    • http://ropafumumere.iblogger.org/49537899616.pdf
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5ffd6073cdd19.pdf
    • https://cdn-cms.f-static.net/uploads/4375702/normal_6028ba5861778.pdf
    • https://cdn-cms.f-static.net/uploads/4370275/normal_602e127f743ae.pdf
    • http://save50.pro/uc_browser_video_er_freep4bfy.pdf
    • http://dimupure.22web.org/709828801.pdf
    • https://cdn-cms.f-static.net/uploads/4407989/normal_6022531b91245.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sijikipemed.rf.gd/64977548368.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_b4b4841383b045c3b12f518c26490d6a.pdf?index=true
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_c649684343764f33850d13fa197c4a09.pdf?index=true
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_4bcf2d3458fd4af5a0909a2de8082405.pdf?index=true
    • http://kutadomirezo.rf.gd/guide_de_l_aidant_familial_2017.pdf
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_c07f3a3d6cce41bfaef40993d46a44c0.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_off0000f6a5.bin
ba1d974097df3a46971e205aeb8260ebc9ed91e0b457d448ffda9fe9c957cad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 5268 bytes
font_01_sfnt_off0001089c.bin
f6d19290c169f5f7c0bcca734f925fe146861c52c5e3ae6fca1517fa5bab873e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 10864 bytes

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