Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d92422c090e786c…

MALICIOUS

PDF

78.6 KB Created: 2021-03-21 02:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b9391502dda4d031a0ec21fc0da6356a SHA-1: 217f2d7489c67ad8c18e3f4f1722877bc87b935f SHA-256: 0d92422c090e786c654ab04b5e30ac75fdb615eb0d14258e6a68f4634b1f17c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=practical+report+on+aggregate+impact+value+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452389/normal_604309a58e0df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5ff197e777797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_60281e5926900.pdfIn PDF document text
    • http://tipatav.22web.org/43426710592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5feb75df64acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_6048866d2e21c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6011e1adae5f6.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/61703153112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_602c2e34d1de3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5fca6e192ce82.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/male_bodybuilding_workout_plan.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/3759402.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/gobelugotebodim.pdfIn PDF document text
    • http://bukejasinopa.22web.org/kegobinaxivedazagitusumeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzenif.rf.gd/diviser_en_2_parties.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/transformers_cybertron_optimus_prime_toy_review.pdfIn PDF document text
    • http://jekabuwof.rf.gd/backtrack_5_manual_espaol.pdfIn PDF document text
    • http://zevusup.atwebpages.com/sewapinotodelevixi.pdfIn PDF document text
    • http://leronusofawu.epizy.com/kobabido.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5312 bytes
SHA-256: a993b967b183e1abe3b196d67f119375ae888de38477179c9fc4b015bb2fe612
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 11320 bytes
SHA-256: 128dc0b20dd8bea62ac68c7d0dcced36047bf683637aa4d067a93a797ebed923

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