Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f0d8f359998cd9…

MALICIOUS

PDF

112.9 KB Created: 2021-02-28 12:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 199822879374f39a006d8513777a17e7 SHA-1: 1c12c3d16f0be2435a193a3f8a57017c14943ea0 SHA-256: 50f0d8f359998cd9f6beffb341cd482d7bd55c29c817b46167672523ebac5dbb
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, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to "Midwest horse fair 2020" and the authoring application "wkhtmltopdf", which are likely used as lures to attract unsuspecting users to the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=midwest+horse+fair+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60391f131b113.pdfIn PDF document text
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/sutufagojox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488349/normal_5fd77a905657f.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/16.1_our_dynamic_climate_key_concepts_answers.pdfIn PDF document text
    • https://jutegejedexugak.weebly.com/uploads/1/3/5/3/135384922/7966390.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/5881459.pdfIn PDF document text
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/rusiwowaxi_jenibixikat_gelonowuj.pdfIn PDF document text
    • http://benovezim.22web.org/19679356969.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/37861ed.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/lofetiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_5fedd90dd824e.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/f626365ed7664e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pilazi/vocabu_lit_lesson_5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/vowofutivejotetowowa.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/57755292992.pdfIn PDF document text
    • http://gipomafusabakix.rf.gd/vinexaxavewipim.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_off000173cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CD 5332 bytes
SHA-256: 53a9607af29d6bd36a623940feb2e7a4381c7636a0086e863c91db0ff972c87a
font_01_sfnt_off00018600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18600 15732 bytes
SHA-256: 07f0ff767cd8df6c419b36b51a1d2d7057b52ded2ef9b866f18105cbcd5ee855

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