Malicious PDF — malware analysis report

Static analysis result for SHA-256 3549e721b27e8e72…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 20:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 024c7616f34f4cdf7c14e7a6062bb0e9 SHA-1: 0670767d8011c5d03313a5d4bd9aa31e7a6ab4e2 SHA-256: 3549e721b27e8e728f1cf467c16055895d504a5364d17f2488ccea374b760e5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as potentially malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=football+picture+quiz+questions+and+answers PDF link annotation
    • http://scoretdho.best/introduction_to_sociology_ritzer11n8k.pdfIn PDF document text
    • http://qrastenmap.online/96857610111u4e1t.pdfIn PDF document text
    • http://lifeshop.pro/59135639819n80ny.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/adaptic_touch.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/20899495130.pdfIn PDF document text
    • http://jushq.pro/how_do_i_get_a_private_investigator_license_in_texasmx646.pdfIn PDF document text
    • http://hot-money.fun/81275919299udp60.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/adverbs_of_frequency_exercises_with_answers.pdfIn PDF document text
    • http://psylath.com/dusawofinilvfv6k.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/fisulefajow/65602942078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86401cd-5c69-4f65-8188-e45af0e9f8ed/42940537814.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/31760208770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7933ec-f7bd-459e-87e5-db5543aafe3f/mark_7_dillon_650_750_pro_autodrive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04f0005-2bcc-4b4d-b67f-d6e87a3b64dd/how_to_contact_the_usps_mail_recovery_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5410c79-33d7-4815-9aa1-b6966ef482f5/xixotawugowagorowekudiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbbcc48-94a6-4743-8efc-bffd20d4c0cd/lizevulinugamobafuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c43f55-e659-4d50-89eb-c0ab05c2c751/stephen_king_it_original_movie_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3123315-3f29-413c-828e-3e94d315e7b3/casio_g-shock_ga-1100-1a3er.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/xovegaronotawuvalotal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98eb9716-2ba1-4a90-9687-9cda91efb110/zanofafuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51f781d-3825-4dec-93d2-9950b1cab66e/rowawipepujoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be76c9c7-01c9-4790-bebd-6c35a86f6c78/waterpik_water_flosser_costco.ca.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5428 bytes
SHA-256: ef04fed860db767fe0f939043cb426d70dee8e0b3f32bdefabcb6682a7640fb3
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 10904 bytes
SHA-256: 4ad33cd0e0994a76a85a9d6a499c27f1c53dd2ad718b97ae2b2d11cf7d05402b

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