Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffc7598774c59d8…

MALICIOUS

PDF

85.3 KB Created: 2021-03-20 11:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 477a037a02fae0e0288166e836587f49 SHA-1: 64786d0b63c0ca64ab05164091b05228c1ed255d SHA-256: dffc7598774c59d8fc158c794e9bfb1521ad6f6fe226142e70bb08a3ec6dd32c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF files, some of which are marked as benign, but the overall pattern of mass external linking from a small PDF is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=1-99+range+guide PDF link annotation
    • https://cdn.sqhk.co/dirodivive/gdhijgF/65906636089.pdfIn PDF document text
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/9001537.pdfIn PDF document text
    • http://autolombardpro.ru/tixamanejofugozubijenedaf22g3b.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/jiruzodomuf_xepawarasewunu_suxipove.pdfIn PDF document text
    • http://autokenn.com/cantata_tool_tutorialck4q8.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/haKeTib/tenejilalibabolumasurikag.pdfIn PDF document text
    • http://airet.space/tejerezawagezokazunegemimk4w85.pdfIn PDF document text
    • http://yazansoft.com/vijusovusojomilisgchl.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/jifohfk/37417419857.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/cje6tNG/93157036625.pdfIn PDF document text
    • https://dejizova.weebly.com/uploads/1/3/3/9/133986792/3850438.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/4797444.pdfIn PDF document text
    • http://kyponnik.online/rain_alarm_pro_apk_crackedp5zz9.pdfIn PDF document text
    • http://findssldz.xyz/39976094384vl6xz.pdfIn PDF document text
    • http://intereriia.com/xefupifulimozafineq94ct.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/9670924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://devugagevubuz.rf.gd/android_sdk_default_path_mac.pdfIn PDF document text
    • http://dagewokoxigu.rf.gd/building_materials_and_construction_technology_notes.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_3c81f55df019463096272c091a34dce8.pdf?index=trueIn PDF document text
    • http://zumepif.rf.gd/formula_para_el_volumen_de_un_prisma_octagonal.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_d4e478e746f8426da2d6741e94b15c5e.pdf?index=trueIn 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_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 4928 bytes
SHA-256: 3c3384551f50afba86490a74fde224372f40ed9f9a51985589906cd0f80fdd9d
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 11248 bytes
SHA-256: fa4e3f122a1fcd0624df84be415c96e946d2087056f33f989279dbd85058ba8d

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