Malicious PDF — malware analysis report

Static analysis result for SHA-256 031e33376df345fa…

MALICIOUS

PDF

81.1 KB Created: 2021-04-09 06:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2670cdb8d46933a2407137213081fc3 SHA-1: ecba770118e70e8f55b9fddc45afdd8729cbbb04 SHA-256: 031e33376df345fa3e681ec08aa1d96c89f141f7ecd30f9c0f599c8b7306d6fc
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The primary URL, https://jumiwimov.ru/strik, is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content.

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://jumiwimov.ru/strik?utm_term=cuanto+cm+es+un+metro
    • http://suvuxivenorum.mypressonline.com/54927084909.pdf
    • https://cdn.sqhk.co/xumelesep/gVoMcc8/xifubakogusigajotudir.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_60419c0a572e9.pdf
    • http://reassurez-moi-fr.info/duzagaziwetidalolokigontnmss.pdf
    • https://cdn.sqhk.co/rabetejorazi/hihqCjb/lakha_banjara_video_hd.pdf
    • https://cdn.sqhk.co/pizibimo/Ciagejh/addition_math_worksheets_with_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5fcbdfd3a66c6.pdf
    • https://cdn.sqhk.co/serodozire/dnrgj62/pc_creator_pc_building_simulator_ios.pdf
    • http://lubevos.scienceontheweb.net/15546287595.pdf
    • https://static.s123-cdn-static.com/uploads/4451205/normal_6007f0c6b2b76.pdf
    • http://hellesypakk.online/lapawiganmi9ur.pdf
    • http://wordsideget.top/wapenulosavf0n0s.pdf
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5fe507b767a6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_988553c664b64988b1661377956ff0c2.pdf?index=true
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_43d7078dc8d943598f6c219726c5139b.pdf?index=true
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_506f51194399402391e81d57727c7ae0.pdf?index=true
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_afc16485e7594476a547020992edbaee.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd8.bin
ac5630077c440e9b329ea891e5f690d3e6bd41333d73f219843906f88958be0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 4768 bytes
font_01_sfnt_off0000ffe9.bin
0fbf3c3ac39a9df3d81872e00c0794a686e55c72cb9ed326726da1429f3281f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 12164 bytes
font_02_sfnt_off0001279b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 4324 bytes

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