Malicious PDF — malware analysis report

Static analysis result for SHA-256 e153229f5bbf1024…

MALICIOUS

PDF

92.5 KB Created: 2021-03-20 22:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b033249f58cf295f927df932bc856920 SHA-1: b7627069ee6971246a4d56c761d375aa995af6f9 SHA-256: e153229f5bbf10246b68ceaf80803adc47883386b2611db8435f25539c7aa4c3
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'plant cell diagram crossword answer key pdf'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=plant+cell+diagram+crossword+answer+key+pdf
    • https://cdn-cms.f-static.net/uploads/4497370/normal_603d7c88b1c0f.pdf
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fefdf9672279.pdf
    • https://cdn.sqhk.co/wogokodu/fGW7jiC/vopebojowuleguwovapamumar.pdf
    • https://cdn.sqhk.co/rotuzuwibi/ihEX0hL/metal_slug_defense_hack_apk.pdf
    • https://cdn.sqhk.co/legexere/7idsjiQ/7198303664.pdf
    • https://cdn.sqhk.co/zokosofu/hhhfig8/anime_avatar_creator_make_your_own_avatar_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4469106/normal_601ddf3ee6e8f.pdf
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fd24fb9e682a.pdf
    • https://cdn.sqhk.co/zolewiko/QghdA4P/mobefexikitu.pdf
    • http://wukosuwusa.iblogger.org/87583532599.pdf
    • https://cdn.sqhk.co/bogulevim/2I6jvih/28276715802.pdf
    • https://cdn-cms.f-static.net/uploads/4461748/normal_603e95af4867f.pdf
    • https://cdn.sqhk.co/valujoper/BgjhaHn/46470916887.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vazegazu.epizy.com/1617715605.pdf
    • https://uploads.strikinglycdn.com/files/f26b8573-df8e-45d7-aa65-fc255215f1dd/3078377712.pdf
    • https://uploads.strikinglycdn.com/files/ee7e0efe-0346-443f-a189-e2c4517d9fe0/grammaire_franaise_download.pdf
    • https://uploads.strikinglycdn.com/files/5dccb41d-ca30-4117-8ce7-c8784bd80b84/fokurazazovonivijumi.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/88175035710.pdf
    • https://s3.amazonaws.com/furunumaroxun/xitakenulilisagepudezif.pdf
    • http://datufubizut.rf.gd/95129037464.pdf
    • https://uploads.strikinglycdn.com/files/ded628d2-186e-4fd4-ab48-30bce36b3f38/android_app_development_price_in_india.pdf
    • https://uploads.strikinglycdn.com/files/c8989d1c-bc8a-4a00-9724-885cd01d3dd6/can_i_use_my_adt_system_with_another_company.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f1.bin
c869c2d43aa60ddda04143acf62bdb045c67668f03b59297093bd195d64d24e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 5520 bytes
font_01_sfnt_off000118ac.bin
375057a6e38a4d92e756b6f608436c1e5b6968fcf30c5f23ebb592111854dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 11556 bytes
font_02_sfnt_off00013ff7.bin
012bf4c2f2303dd570f5c0063ed34764aec83978271a15c7662d4d24577f6c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 16460 bytes
font_03_sfnt_off000155c7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155C7 4324 bytes

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