Malicious PDF — malware analysis report

Static analysis result for SHA-256 c970bacd87faf75e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 20:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4fe767c7714a201995768e54e3421f26 SHA-1: 309541ba89c585cac44a81df0692623b777a09fd SHA-256: c970bacd87faf75ed6cabb356b20baa94ed42eaacf27a865698592300924c3ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://bologen.ru/123?utm_term=atrial+flutter+treatment+guidelines PDF link annotation
    • http://svoytrylend.xyz/39046018313ikzgu.pdfIn PDF document text
    • http://bodyita.space/fake_caller_id_hack_apkttjp7.pdfIn PDF document text
    • http://9gusevshop.website/marietta_ohio_weather_report8h8qq.pdfIn PDF document text
    • http://talinab.iblogger.org/how_to_backup_android_phone_to_cloud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_60226bb10942a.pdfIn PDF document text
    • http://lofupijuwox.22web.org/gisofawe.pdfIn PDF document text
    • http://sovetnik53.ru/definition_visual_cultureyh86b.pdfIn PDF document text
    • http://shopwithsale.website/what_medication_is_used_for_heart_failure35ozz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_603a2c4e3351d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/add8bfaf-dc0f-43a9-8ddd-e2d7cb3afc0d/76722506253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2ee10b-4c78-4a1e-a515-398314347040/vewutusugofujexabopozofe.pdfIn PDF document text
    • http://jatujij.rf.gd/sobedegesexitumi.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/54245695386.pdfIn PDF document text
    • http://nareboveridur.epizy.com/wish_you_happy_birthday_cake_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf32bf0-d8a4-4e16-a854-859b6f558733/libro_de_espaol_segundo_grado_lecturas.pdfIn PDF document text
    • http://nilikimapineti.epizy.com/samsung_top_loader_washing_machine_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0eef98-ce86-4a26-bfce-982e34d44f65/80692455241.pdfIn PDF document text
    • http://fozijasorizol.epizy.com/perakiraw.pdfIn PDF document text
    • http://piludid.epizy.com/opposite_adjectives_games.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/33217517566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce657e73-b313-4810-a7b8-a14e4d7a90dc/can_an_ordained_minister_marry_a_couple_in_georgia.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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 5216 bytes
SHA-256: 3a5bf6d264bb2eff72332c38b862cdb6ecc7c6f293276e666368995cc1d4881e
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 11076 bytes
SHA-256: 76f576be0fa3a9c179d9dd1c1e4576919298366e04959c0bf550676376c29f8d

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