Malicious PDF — malware analysis report

Static analysis result for SHA-256 703640770d705156…

MALICIOUS

PDF

72.4 KB Created: 2021-02-19 21:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 65104278456c373a560506ec65218ff6 SHA-1: 2d5ee413245fa741f8089d55b0b9c4b977856fd2 SHA-256: 703640770d70515687a71a87aa28cefef50274169a6566799f8b24eea57ef496
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical detection for a link farm and a high ML score. It contains numerous external URLs, with the primary ones pointing to potentially malicious domains. The presence of a link farm suggests an attempt to direct users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/123?utm_term=curse+of+strahd+milestones+reddit PDF link annotation
    • https://cdn.sqhk.co/duzoxibuf/KhhjgiB/dologipojigogof.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/0T59pZ9/64228042628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_602b735a61369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_5fd1345d76bdc.pdfIn PDF document text
    • https://berajodisi.weebly.com/uploads/1/3/4/6/134651265/6f470e64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6010c7aaf3b28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_5ffe505802f31.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/ghGSjjb/63280604656.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/JqeUjhc/black_panther_comic_book_series.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5ff5c3ca072a0.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/gfBdhbZ/76262887026.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/aiis7k2/bright_accommodation_pet_friendly_caravan_park.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/Rgghghg/jiritopaledaxite.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/fC3ghpV/kitebamikunivexizatani.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/edjehiq/pet_doctors_of_america_3rd_street.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_6011aca57611d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fc9ae367b64b.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/satudifin/find_the_missing_corresponding_angles_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/concrete5_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/coordinate_geometry_o_level_worksheet.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 5052 bytes
SHA-256: 4acac02c999f2ba04601248b36a6385d536351e251a21ad9a3caa96d6962cf05
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 10400 bytes
SHA-256: 5f018954c7040e90cf20875e56e9fa6e2bf9e5f015fd8de9aef340709c4f4d3b

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