Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df396605c2d976d…

MALICIOUS

PDF

87.5 KB Created: 2021-04-19 01:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fe324cba9524edb5b37adb8992e0f625 SHA-1: 33f6cf7bf09e5c42a4b85e99474fc77dc7e8b14b SHA-256: 9df396605c2d976d69ac7d939bf6f936045e2ff505030d5f3c370247ac82b6b4
186 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, exhibiting characteristics of a link farm designed to host numerous external links. The document contains a large number of URLs pointing to disposable hosting and potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/strik?utm_term=langston+hughes+thank+you+ma%2527am+questions PDF link annotation
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • http://shtangye.xyz/is_calculus_1_differential_or_integralyvpow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcba50293afa.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/2cf360ba.pdfIn PDF document text
    • http://prizinsta.online/peavey_classic_30_made_in_usa_manualjpm4y.pdfIn PDF document text
    • https://guwagigiruf.weebly.com/uploads/1/3/5/3/135303004/kebufiribukuze.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/6740492.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/5352803.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/478989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_600a6ce2a6c9e.pdfIn PDF document text
    • https://kakexesasag.weebly.com/uploads/1/3/4/6/134614155/fagabobumorisose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff569724b79e.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/bebovomugige.pdfIn PDF document text
    • http://siondez.ru/foxidajasemogopitelabanukc88k.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/dd_miniatures_monster_menagerie_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_6051bad1798ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fffb7070052e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvamawijivef.atwebpages.com/gasetezukura.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_89c9a599c7014a238b2eb811ffdce23d.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_baa6c66522eb41ff808cb52b2638bbc4.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 5236 bytes
SHA-256: 2d210bb8ea578f8d41c291c7e1f475533c49010c1588aa3c5bac178f92aee207
font_01_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 11040 bytes
SHA-256: c9a46f0ef2e46183cfe44acc6142c78372ff2f403e56c43f84f9b1b933835bd9

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