Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efab3a590ad879d…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 08:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c85ddb218b48378f1e733b52e04217ce SHA-1: 9bc07946d181b95aac0453e97fc6f84a8b0fd1c7 SHA-256: 2efab3a590ad879d72ba6a921c3cd5c4cbefd269c6fecf8882d6f46c09465f6e
156 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a link farm, containing a large number of external links, many of which point to other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=hafele+furniture+fittings+catalogue+pdf
    • https://cdn.sqhk.co/sepagumal/Hbjhijn/pezapivewiriwuwapibazo.pdf
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/mosabu-leruxef-sufofamog-bopironokara.pdf
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/d09b45fb12f.pdf
    • https://cdn.sqhk.co/rorezina/ieUjjgi/temijusukiduwawul.pdf
    • https://xizonadap.weebly.com/uploads/1/3/5/3/135326441/zekabajikivid.pdf
    • https://cdn.sqhk.co/lifupowaseli/ejbjiic/24661666939.pdf
    • https://cdn.sqhk.co/jonidamifene/DriiJhc/live_tv_apk_ios.pdf
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/guxejiduzole_nejurun_lolibuxe.pdf
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/zimevumajapavuzugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxalowafokuvo/ap_stylebook_2018.pdf
    • http://nafivinada.rf.gd/levy_county_sheriff_arrest_reports.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_6dfcd4f598c6433ba0939ce3a79abe69.pdf?index=true
    • http://luxorofanogefa.rf.gd/5525523807.pdf
    • https://s3.amazonaws.com/lorugipopuxe/what_is_geocentric_theory_and_heliocentric_theory.pdf
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_c0487c0841e2468eaafc071957cf7f65.pdf?index=true
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_9927e6bd80b446ee9db132781e7c78cf.pdf?index=true
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_0bfc4b7187da459e883cfb6c2077de9e.pdf?index=true
    • https://s3.amazonaws.com/wixatax/system_user_manual_template_word.pdf
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_f951bbbafc6642d2bc454fe7ff429462.pdf?index=true
    • https://s3.amazonaws.com/laginekux/vuralenexipuso.pdf
    • https://s3.amazonaws.com/jefobexapulow/template_iphone_xd.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_off0000deeb.bin
4ef12c1b51bf725880d83733edffd7fa4c905b5dcb9d1e27d2baf45a202808a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5284 bytes
font_01_sfnt_off0000f0f7.bin
e16b31615289965939d18ea7f009e9c7bb22097db806cc43c6f217d6f5fed0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 15840 bytes

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