Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3864e27c913aaf…

MALICIOUS

PDF

109.3 KB Created: 2021-03-24 05:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e6ccec6ad0d16580d72aebce5b30ed5 SHA-1: d87b61f80218bc471f005b0ec5ff1a10e2341c2a SHA-256: ce3864e27c913aaf6ee7aea0022156cee8e89cb5d5c3c83da4c98d0e2f9e72ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to malicious websites. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dafemum.ru/award?keyword=aristofanes+las+aves+pdf
    • https://cdn.sqhk.co/nawafoxobok/lhfjaqM/the_sims_4_cheats_money_0.pdf
    • https://somizinizerolu.weebly.com/uploads/1/3/0/8/130873918/mojafebovewepoke.pdf
    • https://cdn.sqhk.co/kukisigafumi/hdNEGvX/spinning_top_string_for_sale.pdf
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/zisex.pdf
    • https://cdn.sqhk.co/pananumujo/ighjlgd/89464081087.pdf
    • https://fibupodofakakov.weebly.com/uploads/1/3/4/4/134496100/gitakufatorukaf.pdf
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/guxizujezusopijapa.pdf
    • http://gufolitif.22web.org/balanced_diet_chart.pdf
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/b7aae0e4f757.pdf
    • https://cdn.sqhk.co/gadewekunel/gcibihj/ww2_aircraft_pictures.pdf
    • http://nulagumuxim.iblogger.org/67921258269.pdf
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/samilen-gemuwedaneja-runepinikibemej-kefasodaduso.pdf
    • https://wosexepipoto.weebly.com/uploads/1/3/5/3/135347387/5d0381.pdf
    • http://noxesim.iblogger.org/febekupowezijo.pdf
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/8305211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_0d71118ae0674740b757a26fffbc8e00.pdf?index=true
    • https://s3.amazonaws.com/lakujusitejojet/22903654285.pdf
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_6b6606a5c2ce49bd893890701ff8168f.pdf?index=true
    • https://s3.amazonaws.com/fodose/what_are_your_career_aspirations_sample_answers.pdf
    • http://gonurorirezode.epizy.com/angular_6_forms_tutorialspoint.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_off00016551.bin
686d2954a9fd6734b88bcb49545264dcc76d6e3b58073ddba4ba2f7fc720c33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16551 5084 bytes
font_01_sfnt_off000176b3.bin
42b3a97b3215ebbd95cbb2041a9481a79a9d29837df7a17b6b02f1288a621fd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176B3 15544 bytes

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