Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4ff3ce2b78a94a…

MALICIOUS

PDF

71.4 KB Created: 2021-03-19 12:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aafbc3e21990e0b1956845a06f56a2ad SHA-1: a3b2f85d535364d462c4f9846f1800547c92c962 SHA-256: 6c4ff3ce2b78a94ade942cb0b0853487491fc89fe6f126e9d7d47d8eb669b2f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=master+forge+grill+burner+parts PDF link annotation
    • http://jujovobima.getenjoyment.net/14628141976.pdfIn PDF document text
    • http://healthit.space/a_pinch_of_salt_poem_answersacnqb.pdfIn PDF document text
    • http://spoonnumberone.xyz/best_starbucks_drinks_without_coffee_secret_menuuris7.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/english_vocabulary_with_meaning_in_punjabi.pdfIn PDF document text
    • http://fakts.design/95318818709ps5ng.pdfIn PDF document text
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/japik_zofolodifo_bomarigilako.pdfIn PDF document text
    • http://forpost-electrica.ru/48174111446fl4n2.pdfIn PDF document text
    • https://gigijegijozi.weebly.com/uploads/1/3/4/4/134400985/viroriwuzu.pdfIn PDF document text
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/kagis_xosifojisirog_nivigigosug.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/design_patterns_in_c_metsker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_257aeac08a9f4ecda50906b860489b7d.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_a3f2142efaa84cbdaad52033015f788e.pdf?index=trueIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_9c5ffc5f6e3946c8ab199ebfe06c2266.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_ee5ba6ad383f4ce089cc09f65783aa35.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_86067e8dbf324d0fb89b748fdfd4dd6e.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_2fd6f7d038564967afebbceb055631b7.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_caf41d466d214245b123647f3d8aa312.pdf?index=trueIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_fedf3009d2cf4dbbbfdeb1b0837c7c6f.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/95815247690.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/gatufevu.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_c7fa640bdced45e4bc2f93a5b4710abf.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_94425f6893f24dd0a6aa036258ef286a.pdf?index=trueIn PDF document text
    • http://xufolat.atwebpages.com/sakezilubodulitunenaju.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/all_the_bright_places_book.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 5216 bytes
SHA-256: f484eeac7ca301c6558edfb0ef91c8b2178287cc19578b3b0a4853a177307d67
font_01_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 11368 bytes
SHA-256: 6fdb2b5ddce74f2cddd8c86e2afaba3c8fac12fba0df37c6813a1535fa1305f3

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