Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12e845738db5d92…

MALICIOUS

PDF

72.7 KB Created: 2021-03-02 07:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 967def4ec8fa80634f92f1e9333cd769 SHA-1: b78aae197414945c32617747b113baec98b1a38d SHA-256: b12e845738db5d925a8c9335a02ff20fd9aaf2307746b27d87e2d33c430d1fc2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'fishing report' keyword, reinforcing the lure. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://xezojetit.ru/wix?keyword=westport+ma+fishing+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467005/normal_6024725c1be3c.pdfIn PDF document text
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/miwajulezewak.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/1315544.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/796746114.pdfIn PDF document text
    • https://malafusid.weebly.com/uploads/1/3/2/8/132815748/teluseni.pdfIn PDF document text
    • http://dazipuv.iblogger.org/logakunubawedaxaxexaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_5ffc5e0f5bc61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_60148142c3026.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/2f44e.pdfIn PDF document text
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/854a13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5ffc307027694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokatutabojew.rf.gd/buditugesumuruvexuvafuze.pdfIn PDF document text
    • http://mibavened.rf.gd/2148109832.pdfIn PDF document text
    • http://mejufupivu.epizy.com/which_of_the_following_is_an_example_of_a_personal_essay.pdfIn PDF document text
    • http://matiwusaned.rf.gd/1827983910.pdfIn PDF document text
    • http://livirava.atwebpages.com/is_a_2012_hyundai_sonata_hybrid_a_good_car.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/what_are_48_laws_of_power.pdfIn PDF document text
    • http://fisuwadufojotu.rf.gd/xilesuwolukagejo.pdfIn 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5296 bytes
SHA-256: 71bcec232493e617ea867e02382674959e7addeb4f10836e06c69f0341a17673
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 10796 bytes
SHA-256: 2d8c20070d06e02e9d546cbea90ab53fd290a6b8f323007a91c607feafa02e1e

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