Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7686d7be474e3af…

MALICIOUS

PDF

73.2 KB Created: 2021-02-13 20:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dfa0e881965364769aae3b6798b9a3eb SHA-1: 9715cef6a938823f0fbe51fb90fc8e174417d74e SHA-256: d7686d7be474e3af09f7f30b5667a6aac730ab3a4d2a8925ce713cb4c8d62b54
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a redirector link and a large link farm. The presence of numerous external URLs suggests an attempt to lure users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the link farm and redirector points towards a phishing or malware distribution campaign.

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://yafferge.ru/wix?keyword=trb+tam+conference+2020 In PDF document text
    • http://kakasusalulul.iblogger.org/aspen_and_academy_guidelines_for_malnutrition.pdfIn PDF document text
    • http://reduslim-official.website/72131652390ktxzb.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/igfgiig/28120499625.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/jiLjajj/tw_meteor_storm_rocket_league_xbox.pdfIn PDF document text
    • http://salestore.pro/11657517860zp0kc.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/ChcB4gf/draw_out_game_rules.pdfIn PDF document text
    • http://triple-doska6.club/39551816467vwz5q.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/fasexoloridajel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_60264101cf3a4.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/S3IhTy5/skulduggery_meaning_etymology.pdfIn PDF document text
    • http://begdas.space/813970117685tvva.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/29e1392eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitugoxopezuwu.rf.gd/76164707261.pdfIn PDF document text
    • http://zorogeloma.epizy.com/zegatuserisup.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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 5180 bytes
SHA-256: eb0b9c3d689421702e789addc5d7c293500a8ed0f0d1422c132a870df5c369c6
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 10032 bytes
SHA-256: 4ff1e8a683d6a9e7fc35b9614d759f1d309f200f02134832ad154d19e6b81055

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