Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed48eaa36378b72…

MALICIOUS

PDF

76.9 KB Created: 2021-05-01 11:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 894f72626a88f0cfe83b8a57ff015666 SHA-1: 80b30eb8f53f80477ca0115cda2e0e92e9ebfba3 SHA-256: fed48eaa36378b72a768cf372e979b09ed5ee47ee5dc160f366be03f9179c6de
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO scam designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to music theory, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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+are+the+elements+of+form+in+music
    • https://fenuligor.weebly.com/uploads/1/3/2/6/132695430/7057600.pdf
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/583e8b2f6.pdf
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/7926730.pdf
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/soxejubuwatumuganine.pdf
    • https://cdn.sqhk.co/libavesonon/jW0gfRN/dbz_battle_of_gods_arc.pdf
    • https://cdn.sqhk.co/noneniwetav/Ohcieij/36579814643.pdf
    • https://bivejeweki.weebly.com/uploads/1/3/4/3/134322338/9119709.pdf
    • https://cdn.sqhk.co/jaziwuke/agiEorA/39310766246.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sixolose/boxujisokujot.pdf
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_569b12bdf6604f52b27e43f808250119.pdf?index=true
    • http://wetowudokik.epizy.com/3_binomische_formel_berechnen.pdf
    • https://s3.amazonaws.com/vokeri/the_story_of_arthur_truluv_book_review.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_c2fae61c03c5457fa08fd1986db7bf0c.pdf?index=true
    • http://meganisaniwo.rf.gd/66526700841.pdf
    • http://kopivenegi.epizy.com/15532434426.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_a3222de2d8894ebe8425222e49d118f6.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c8ddd29c8c294e9ea8c35356d22b9c26.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_1d2834bf59dc4937a48c49affac650dc.pdf?index=true
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_34528573bdfa492dadc2b01556a8fba6.pdf?index=true
    • https://s3.amazonaws.com/mesotodimus/nimafomanebemelobexaluse.pdf
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_f9fa45bf5f784cb9952529b15523b4aa.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f8.bin
edb6cc97e579fcf71b4b94acf65aef9429424fadc5943d6bf39d7b3dd78bc4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 5136 bytes

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