Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd687c5bb841cc2…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 10:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 392a83d44cce7b936659453205fcf1b3 SHA-1: e2cb7ff971792673b53ec829a8123a235d6aeca3 SHA-256: bfd687c5bb841cc219d12471f8b569bdc42646ff3a0276f922c6800ced8d8c0c
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a malicious payload disguised as exam answers. Although no scripts were explicitly extracted, the PDF structure and embedded URI are sufficient indicators of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://zajinet.ru/wix?keyword=chemistry+final+exam+review+answers+pdf
    • http://maykistore.ru/tosivupekieyldl.pdf
    • http://ooovseanalizi.ru/52862402427qjz13.pdf
    • http://xedoponoteje.22web.org/best_blues_guitar_instructional_dvd.pdf
    • http://zespodsvetkoy.site/25074830187wh9kv.pdf
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5fe4587c91ce0.pdf
    • http://all-system7.xyz/infiniti_g35_manualh984l.pdf
    • https://static.s123-cdn-static.com/uploads/4379049/normal_600123c3d29f9.pdf
    • http://muldwych.com/xafipeditazuwant9lc0.pdf
    • http://dehydratedoriginalgoodness.com/98322443931nsh8n.pdf
    • https://cdn-cms.f-static.net/uploads/4412380/normal_60495c582dc44.pdf
    • https://static.s123-cdn-static.com/uploads/4470537/normal_60027524d4d26.pdf
    • http://smeh-mif.space/nazuwakoburozudutonup91ic0.pdf
    • http://stavki-na-sport.site/glitch_vhs_camera_appw2ad3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_d2da1e3de9774ee680dc5a407b58b147.pdf?index=true
    • https://s3.amazonaws.com/lomuper/21322859511.pdf
    • http://paduwovipubu.epizy.com/food_adulteration_project.pdf
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_7c1d7f3141f547219e8f0ded1e796d29.pdf?index=true
    • https://s3.amazonaws.com/sewamos/hanging_tree_sheet_music.pdf
    • http://zurufeb.rf.gd/49870507018.pdf
    • http://zimofizamar.epizy.com/fender_hot_rod_deluxe_tweed_used.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/61733744727.pdf
    • http://nafopafilor.epizy.com/30925832126.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_caf7610a58374487bf192e7f8afda409.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_off0000f510.bin
614cd4aeccab66abe3f29c482a95cceb6ee0b0608de5ac0a7fe4262aaa82aafc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 5508 bytes
font_01_sfnt_off000107b7.bin
3abc37a2d72c1ebd4f732b825cd002fd9b4a079a0a3d193b504d55c633516d10
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 11436 bytes