Malicious PDF — malware analysis report

Static analysis result for SHA-256 106a8f66427a8133…

MALICIOUS

PDF

82.9 KB Created: 2021-04-02 04:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035178920df17ad55f8c891b98db1331 SHA-1: 3bfe623730d929e267161df12276732d5df8dda1 SHA-256: 106a8f66427a8133b88a176995553840d8e33a47cd200893224a549b36b70291
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are obfuscated or point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=garmin+vivofit+jr2+princess+purple
    • https://cdn-cms.f-static.net/uploads/4383688/normal_6049b451164e9.pdf
    • https://zaruneza.weebly.com/uploads/1/3/2/8/132814400/6343046.pdf
    • https://cdn.sqhk.co/guzupewad/PgcQii7/how_to_get_superhero_mod_in_minecraft_pe.pdf
    • https://cdn.sqhk.co/nanijamu/F0afjiA/florida_agritourism_guide.pdf
    • https://cdn.sqhk.co/purorelaz/ejbrIa4/3483709232.pdf
    • https://sudoxelavekif.weebly.com/uploads/1/3/5/3/135305243/99396ffe071984.pdf
    • https://static.s123-cdn-static.com/uploads/4412900/normal_5ff0ea7bcea88.pdf
    • https://cdn.sqhk.co/rexixugepir/bhehfYp/bitcoin_mining_app_free.pdf
    • https://cdn.sqhk.co/fanoxozowupe/dSjdiiK/who_sings_the_original_hot_rod_lincoln_song.pdf
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/bulurev-vixudide.pdf
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/xepezezuxowuvugujut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_ed0a772881a047f6a06f749aec3d6d12.pdf?index=true
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_050344f99dd54dd5bd281a43e56c39c4.pdf?index=true
    • https://s3.amazonaws.com/podawakumepewez/husqvarna_61_chainsaw.pdf
    • https://s3.amazonaws.com/fikuvine/majjhima_nikaya.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_68eee388388d480683fac60a987a523d.pdf?index=true
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_c5c5c1bed67241a7adc6ea88b8238e54.pdf?index=true
    • https://s3.amazonaws.com/bogeguva/peributo.pdf
    • https://s3.amazonaws.com/mejawiwomak/leatherwork_merit_badge_worksheet_answers.pdf
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_90d2c9adf8494a9b9ba8fc46a2700ef5.pdf?index=true
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_8edda227d111431093711ea11dadaa10.pdf?index=true
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_8bfdd38553c54952878e5079b367ae33.pdf?index=true
    • https://s3.amazonaws.com/boxalewijim/30106726231.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_off0001036a.bin
d60c6913f6c7518cae7be053d5a1faccb65f5086eabd3450cca5a819e26f9b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 5460 bytes
font_01_sfnt_off000115fc.bin
aa589e3e2e3341517b9fc3b8ae86fac49a01d01f3f3cbf3689132c14e073df0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 11812 bytes

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