Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d87bbbc5dfd4d…

MALICIOUS

PDF

76.4 KB Created: 2021-03-29 20:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 53e31eb84f7014b8fc687de2c3231c34 SHA-1: f17bea6c2d5c710df89ab91db87f5ef064797704 SHA-256: 809d87bbbc5dfd4d8e6e1500f78257ee06299c40797384a3304e3a4baf1d05ba
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The presence of numerous external links, many pointing to disposable hosting services, strongly suggests an attempt to lure users to malicious sites. The ClamAV detection further supports the malicious classification.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=emeticos+y+antiemeticos+pdf In PDF document text
    • https://cdn.sqhk.co/fabozesemi/giOP0Lp/free_music_video_online_download.pdfIn PDF document text
    • https://potepivogatofef.weebly.com/uploads/1/3/2/7/132740463/647bd8ed6dc2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6015bd2aebe82.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/gageihs/ates_ve_su_5_element_oyun_skor.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/rjhcCgg/texas_longhorns_logo_colors.pdfIn PDF document text
    • http://kutalevewomem.22web.org/who_is_prince_eric_in_the_little_mermaid_remake.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/naginutid-jeliwu.pdfIn PDF document text
    • https://tekazomegi.weebly.com/uploads/1/3/4/0/134017279/rapikimidili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_60188a4638f8d.pdfIn PDF document text
    • http://3gusevshop.space/82249091159uu3x6.pdfIn PDF document text
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/eb2d63a2d78520.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/hiaEo7I/mini_ice_hockey_rink.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_60604836ccf56.pdfIn PDF document text
    • http://legalvictory.group/how_do_you_change_the_code_on_a_liftmaster_garage_door_openerq78wk.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/Whgphii/jivukinajutesopoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokudubogot.epizy.com/duvizobuvowuwonex.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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 5232 bytes
SHA-256: af8532e76e6d42eb0e9a48c90293751119983b87bbca7f02c181d00969ed5c8d
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 12424 bytes
SHA-256: 8e6fb1defa81b509ddc14015ea99ad64d1acd475ca6a6bcf06640782714b900f

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