Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ada72ac39b69cd6…

MALICIOUS

PDF

71.7 KB Created: 2021-04-01 02:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3fd39ebb08bd8b0e2673b6a6ed6d1dc4 SHA-1: 50b7c366aec1677149911b9a575775192486ad14 SHA-256: 5ada72ac39b69cd6b7c176cd9c9715bbf9842bb548ecbb007ae61b35303bf112
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 0.9998

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 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://baarspo.ru/wix?keyword=answer+mx+helmet PDF link annotation
    • https://cdn.sqhk.co/tirekidifole/jbgEThL/14021908658.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/YjhNOjf/kajavumapeke.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/hgUEibL/50958440042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6063ab1c97991.pdfIn PDF document text
    • http://gevixadita.22web.org/happy_wheels_ios_levels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6045153ad1788.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/1V9Fkgd/49623179848.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/7hiMzii/uc_browser_video_download_private_fast.pdfIn PDF document text
    • http://ripuvajuze.iblogger.org/bejigesotarorijiwomunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445871/normal_60023f99d6df6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xowatelowudok.rf.gd/ball_bearing_download.pdfIn PDF document text
    • http://sozitemow.epizy.com/baba_is_you_android_port.pdfIn PDF document text
    • http://momalovategur.rf.gd/41284085726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4cb73a6-affc-4ae9-b4be-e490cd9ea792/how_to_draw_better_on_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c923b3-7190-4346-b782-e08f0056fd58/spanish_american_war_summary_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e145957-d26e-484d-975d-ed2d2a03c6bd/ribulasusemilef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e7cf9f-4ddd-48ff-a74c-099e9780d835/yard_machine_16.5_hp_42_parts.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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 4492 bytes
SHA-256: ce19a8dc95c0c34b78c3e7729077ab056af07a4c8daa362202d462ac7992c936
font_01_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 11424 bytes
SHA-256: bbf0cd090d0879d1713b1d91269d1c470c685c08cafbea392fc6f15156eb5ee8
font_02_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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