Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fcf6be7dffa518…

MALICIOUS

PDF

62.2 KB Created: 2021-02-20 21:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9371962949e322801b47d7816d5d61cc SHA-1: 955a7c63786e23c948ecb3cb316c4cab16d14c0c SHA-256: c4fcf6be7dffa5183fda68605209f6a9f63a540818850cacbb2342be0493833b
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 0.9996

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://crophysi.ru/123?utm_term=weber+spirit+ii+e-310+best+buy PDF link annotation
    • https://cdn.sqhk.co/joduragenep/wgjhfKV/tujabanidimuz.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/bedrock_server_pluginv5jdz.pdfIn PDF document text
    • http://clientbluebadge.com/game_pianista_modm7fgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_60276c54d00e3.pdfIn PDF document text
    • http://whalesqpa.fun/audio_technica_at-lp60xbt_belt-drive_bluetooth_turntable_-_blackkz8i1.pdfIn PDF document text
    • http://creditchecktotal.info/396700266239xo28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fd318fee9898.pdfIn PDF document text
    • http://scoretdho.best/joviguzetezatibizubagajhfnw6.pdfIn PDF document text
    • http://sputnews.com/zulikaleluvovudowin.pdfIn PDF document text
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/8818853.pdfIn PDF document text
    • https://pakitaxe.weebly.com/uploads/1/3/4/3/134318313/5391254.pdfIn PDF document text
    • http://worldhold.online/asteroids_coming_to_earth_2020vrjdi.pdfIn PDF document text
    • http://swiss-gear-top.xyz/78783282185bj9aq.pdfIn PDF document text
    • https://lanufuxag.weebly.com/uploads/1/3/0/9/130969896/jiraxopuvizajegag.pdfIn PDF document text
    • http://rrrrkkkkk.space/netflix_free_for_pc_windows_76cw5y.pdfIn PDF document text
    • http://mepowixodudod.22web.org/mikisepupovusaluzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 5216 bytes
SHA-256: f75ff494bb3bb8480c3b157d5d509427ef08c5217bdf4d35087128fd77d73618
font_01_sfnt_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 9684 bytes
SHA-256: 858d660c6808b4e6561076246882a21299b6b5ef819834afa050f77ea5b41a88

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