Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f5127462d2773a…

MALICIOUS

PDF

74.8 KB Created: 2021-03-25 12:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f54491837dcd19cae1375551fea3d3cf SHA-1: d1c9208b103d4e41ed6111c72969af5079a7174b SHA-256: e2f5127462d2773a736c05c017b4d4904294b17e40db1c3b523cab19999e25eb
186 Risk Score

Malware Insights

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

The sample is a PDF document containing a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jacksth.ru/123?utm_term=android+toolbar+elevation+not+working
    • http://fastcreditcheck.info/18273664923brz4n.pdf
    • https://static.s123-cdn-static.com/uploads/4478133/normal_60045fc0683c4.pdf
    • https://ronafipilegov.weebly.com/uploads/1/3/2/6/132681204/tirukal.pdf
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/voxogisolumapafu.pdf
    • https://cdn.sqhk.co/xelajura/iaChbie/jodigesirini.pdf
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/04e014251548853.pdf
    • https://cdn.sqhk.co/zonakagud/Y97Xmig/lepezelaguduvagaj.pdf
    • https://cdn-cms.f-static.net/uploads/4371498/normal_60119c22d0ea9.pdf
    • https://cdn.sqhk.co/gagowuname/jfieRKA/3572023838.pdf
    • http://yeswins.space/solucionario_santillana_fisica_2_bachilleraton0m9t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_09156dea0d5b40d695061c0f0a935cdc.pdf?index=true
    • http://wobevewewa.epizy.com/60888408940.pdf
    • http://jelameb.rf.gd/gns3_ccna_labs.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_e2a36d9a609549448b1fa73d98ad56a2.pdf?index=true
    • http://vixoxuzet.epizy.com/petit_bonhomme_allumette.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_off0000e367.bin
43f68f7d698f8715263e6c72c076cdb3f64622f89339d2b3819392527c5172ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5160 bytes
font_01_sfnt_off0000f51e.bin
926c9b013832e079be1afeb628e5a466a7e7eaf90388c3a9c2bcb28c342f05b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 12076 bytes

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