Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7bb13a333a5d55…

MALICIOUS

PDF

70.9 KB Created: 2021-02-24 00:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e9bd156fb2bb0827946d969af80816e6 SHA-1: 2ff78d6f01ee197ec88e3fa71410714072ec25a4 SHA-256: 6c7bb13a333a5d55350526625d3c82773ba91fb716f70e42999b059e216496ec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm points towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=how+to+write+an+argumentative+essay+in+apa+format PDF link annotation
    • https://cdn.sqhk.co/bemoranoz/jcgjIz7/vezarinivo.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/hajj9hg/41908010045.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/DXGL0je/litedorifu.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/41885dda4.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/rulagepapop.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/hiichj1/shooting_heroes-_dreamsky_zombie_frontier_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/giwibilawa/iieU5id/sowapusorojopemo.pdfIn PDF document text
    • http://lumacy.site/zinomajufekopowuzalubxvmrs.pdfIn PDF document text
    • http://antinomi.design/geological_map_south_africa0jt9j.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/hejhkmQ/warhammer_fantasy_battles_8th_edition.pdfIn PDF document text
    • http://dressnbuy.com/emerald_shiny_cheatxpnlh.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/pegus.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/1qifjiB/49728911317.pdfIn PDF document text
    • https://dabamupusoga.weebly.com/uploads/1/3/4/2/134265366/a4c21858eb776.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/6hbbfgh/53957469531.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 5404 bytes
SHA-256: 072af80fb376a021357502c1bdc93f1496f208b294445a098543d1bf550dbf33
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10204 bytes
SHA-256: 62dc643080ca004da7438086baf3bad06424b59d877fde9fe6d7d54c759c3e8c

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