Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d618e771219c91f…

MALICIOUS

PDF

73.5 KB Created: 2021-02-02 00:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 94ed584e7b7c68bea0612f3ec8fd275f SHA-1: 936b7003c2e2518b3805babefd5a2daaf0851de3 SHA-256: 4d618e771219c91f2e70ff4d1fad18a5db78fe285da0716ab7b7447486cd9503
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or spam distribution tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

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://bologen.ru/123?utm_term=rags+to+riches+slope+intercept+form+calculator PDF link annotation
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/f380387.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/bicQhc2/cover_orange_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/sfyjfgj/moto_ride_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/hhjgiZw/ranemobizuderagura.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/jghijRT/70855165100.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/buwafipajofasi.pdfIn PDF document text
    • https://mofutobanu.weebly.com/uploads/1/3/1/3/131383854/3127528.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/aUT3rge/dino_safari_2_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/jjhfjdC/zibawiromazotatig.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/5942626.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/1hbngTo/35275757854.pdfIn PDF document text
    • http://yognat.space/moto_rider_go_highway_traffic_hack_game_downloadza1zv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velumosak.epizy.com/43178649990.pdfIn PDF document text
    • http://suwiwozeko.rf.gd/freeze_spreadsheet_excel_2010.pdfIn PDF document text
    • http://xojaxalevigob.epizy.com/50590946573.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/mukka_express_bialetti_manuale_d_uso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 5436 bytes
SHA-256: afef5fec3fe38be49def32689402b029ab78b574189e6c4df3f271739e44bcc5
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 12892 bytes
SHA-256: fb0aafa25b3adc5064736dac52ce36d69fa9a274cf76ca51e55c74a42083f646
font_02_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10792 bytes
SHA-256: 941e5bd967ed629ef5549602375c826895dadc6ad6b2112e3a4bb7efe0ad04eb

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