Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f37ef9df383413a…

MALICIOUS

PDF

84.0 KB Created: 2021-03-15 12:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00aa72890cc83f87bbac252000764913 SHA-1: 7a3301f046ab4e4409434187fcc4139c2f9b44a8 SHA-256: 1f37ef9df383413ab39c9579a5de947248e82aa52f13d0e6f296421fccee7ced
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs points towards an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=business+communication+skills+course+online+free
    • https://pagilosotutan.weebly.com/uploads/1/3/0/9/130970008/97f5bf413a99886.pdf
    • https://ravuwiva.weebly.com/uploads/1/3/4/5/134519437/poliromi.pdf
    • https://kebezade.weebly.com/uploads/1/3/4/4/134479439/8074f576309.pdf
    • https://fofavaduk.weebly.com/uploads/1/3/4/4/134436242/jofipiwij-fomugolotiwewe-buvudokosezan-jukomupiwusub.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/banuko-kimibusukow-netuwarimevoxip.pdf
    • https://bulabameworiw.weebly.com/uploads/1/3/4/0/134096114/1886995.pdf
    • http://vaxuzorokolate.iblogger.org/98570658813.pdf
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/e8f54cf.pdf
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/6782329.pdf
    • https://wetuwisiw.weebly.com/uploads/1/3/4/4/134495793/5910594.pdf
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/6021643.pdf
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/tugujas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palevijuj/bleacher_report_champions_league_tv.pdf
    • http://zapavuvezozetet.epizy.com/70292724686.pdf
    • http://zixoridepub.rf.gd/pearson_math_book_answers.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_74ea034163274df0ac4de9f3284416d1.pdf?index=true
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_c1731215a69c45be99649bde07635cc8.pdf?index=true
    • https://s3.amazonaws.com/divexikav/filefaduvatawo.pdf
    • https://s3.amazonaws.com/wizidimawag/se_bootloader_unlocking_v1._6.pdf
    • https://s3.amazonaws.com/jubiferekaka/49371031135.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_off00010b4e.bin
66cbbe213e086dff4a502b71c0332e33b900810531a6fc474cd3be560fb4b280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 5140 bytes
font_01_sfnt_off00011cb9.bin
fecbea79a6e1ae5bdeb9b3dc0a449e7574a6408f4f56071f8e070aea56b22382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 10816 bytes

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