Malicious PDF — malware analysis report

Static analysis result for SHA-256 712b5eaf3da8738a…

MALICIOUS

PDF

72.1 KB Created: 2021-02-21 10:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 177b208c954693540828d5194bf6a3fb SHA-1: 5d033f45cbe0ee402b3565bf85ebbbbe3cfe1759 SHA-256: 712b5eaf3da8738aa04c7b746e6ff3ff79547de8b354420a5049d7a1da0e5cb4
186 Risk Score

Malware Insights

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

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 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://jacksth.ru/strik?utm_term=internetworking+with+tcp%252Fip+volume+1+principles+protocols+and+architecture+pdf PDF link annotation
    • https://cdn.sqhk.co/rewaloxuruvu/iyiahec/critter_escape_mod_apk.pdfIn PDF document text
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/d46ff74602f7.pdfIn PDF document text
    • http://legendarycraft.ru/lewis_structure_worksheet_1_answer_keylcq1h.pdfIn PDF document text
    • http://twenty-promo2020.ru/basulagetisisopativabarwzrc1.pdfIn PDF document text
    • http://xtw2.club/susopuzigowuvom7ycbo.pdfIn PDF document text
    • http://silkhfig.bid/petro_canada_gasoline_msds_sheett2saw.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/cgfjjhf/orange_ball_tree.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/6883671.pdfIn PDF document text
    • http://doweryklkq.space/percy_jackson_cast_all_movie2wv3f.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/aijjjhj/stock_car_racing_magazine_covers.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/89914581108da.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/ieDjaje/42028322725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/gumewex.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/kerowovolodatafegalibuxen.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/google_analytics_reporting_api_quota.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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 5812 bytes
SHA-256: 61e60dac469affdc7b35518412166bcf823d27adbc4e5c8a842da14819e020b8
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 11252 bytes
SHA-256: 59b93ce636804dde9ff2d1359c65cf8433571a1d61197db324b397d697061f8f

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