Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d56055b9bb33fc…

MALICIOUS

PDF

75.6 KB Created: 2021-05-13 20:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0af5c8bd16569cb26fb9924181f8c39a SHA-1: f4e0f3748d068a90aa58410399f0b0c1d9493252 SHA-256: 94d56055b9bb33fc06967504c4b38f667d19fcd715f3fd5d3fcbf036420b975c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://pelibifir.ru/strik?utm_term=what+happened+to+nuance+power+pdf+standard', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://pelibifir.ru/strik?utm_term=what+happened+to+nuance+power+pdf+standard
    • http://nukels.xyz/641324483764rks5.pdf
    • https://zexuboru.weebly.com/uploads/1/3/2/6/132683252/7763512.pdf
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/tedes_rulepomukulax_tosej_wivokevifuf.pdf
    • https://cdn.sqhk.co/sugojipo/3esgfcY/men_s_fashion_guide_to_suits.pdf
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/7db521.pdf
    • https://cdn.sqhk.co/xokunafuse/k0hdiZR/52214507508.pdf
    • http://raifaisentgo.online/death_march_to_the_parallel_world_rhapsody_light_novel_13ss8bn.pdf
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/gotebaresi.pdf
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/1457551.pdf
    • http://igonlinesupport.com/icecream_readerrtl6q.pdf
    • http://varistop.site/lagu_man_ana_versi_indonesia2q3jx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_dee0066140794db88b1aa75cef14cb77.pdf?index=true
    • https://s3.amazonaws.com/xisefowu/pogipimilowomibijite.pdf
    • http://marelifi.rf.gd/rawejowobemafemetovuwuxej.pdf
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_b2d44acf545b4e399c08cefb361cafd2.pdf?index=true
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_24bd167975da4cae90128553b074c7d8.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/no_ad_browser_apk.pdf
    • http://wuluminibopa.rf.gd/51531529575.pdf
    • https://s3.amazonaws.com/tazibabebamep/skyrim_unofficial_patch_not_working.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb61.bin
258a9fc60caa35ebb40b5e7b74447efc7b08547070829fb6d36779d2ff9cc38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5316 bytes
font_01_sfnt_off0000fd8a.bin
db10706a294db851cadf655964f168b118073c9db2858b50bc310551f8430c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10256 bytes

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