Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ccaaf80b28e358…

MALICIOUS

PDF

73.2 KB Created: 2021-03-27 11:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c433da8e26cc679c92fccfe81200bb36 SHA-1: 413fca9b59d0d61105e6f7b4a3738b4f79ac9b74 SHA-256: c1ccaaf80b28e3587baadfde1c51119a76f92146806dd4cb150cb328540e21e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://lozipotod.ru/award?keyword=admiralty+notice+to+mariners+pdf', indicates a lure related to maritime notices, likely to deceive users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=admiralty+notice+to+mariners+pdf
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/fibupef.pdf
    • https://cdn.sqhk.co/wamitavixitu/I78jbNT/bauer_bodoni_std_font.pdf
    • https://kazimiposaduvab.weebly.com/uploads/1/3/1/1/131163956/vokigozakitopa.pdf
    • https://cdn.sqhk.co/risenulowo/h7qmihq/sound_effects_download_mp3.pdf
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/zamafipedexifoz-disapovukidone-vefasatoj-nupuwogugi.pdf
    • http://sodaapp.pro/penatizimukofosugilugusqqyd.pdf
    • http://psychologyrelax.xyz/46317234231gg2jo.pdf
    • https://tixaxofafebefut.weebly.com/uploads/1/3/4/6/134634111/guluxaresilo.pdf
    • https://cdn.sqhk.co/xaleteser/bgfAnij/9598098436.pdf
    • http://hookup668.site/chiari_malformation_in_older_adultsyx8c0.pdf
    • https://cdn.sqhk.co/kubepugemaki/SA0jg5G/plain_city_ohio_county_auditor.pdf
    • http://xtreme-sport.ru/66155065565omhae.pdf
    • https://cdn.sqhk.co/zikegasenar/ieyheh6/82175663060.pdf
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/rulafire.pdf
    • https://cdn.sqhk.co/bipuzojafa/hrntjUI/advanced_bookkeeping_aat_level_3.pdf
    • http://tuimag.ru/tiktok_creator_fund_pay_per_viewoek25.pdf
    • https://cdn.sqhk.co/bomoxale/1zMjcZ9/98000345507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jajuzasalikirut/15344981380.pdf
    • https://s3.amazonaws.com/pozokimepe/sorcery_apk_obb.pdf
    • https://s3.amazonaws.com/kibavutibeved/rental_check_in_check_out_form.pdf
    • https://s3.amazonaws.com/dewutexorob/47791214712.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe2.bin
ec6b438c96fc5add6939092d8f132d6d2072ac2b9498d96f2d2ce8500eedde65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 5392 bytes
font_01_sfnt_off0000f22c.bin
d3be2787398f05f54bb3831300d2c8c207309d3aab1f0a4297b77f63ed25c3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10916 bytes

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