Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1084161c55bb63f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-08 18:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e2e86aab085657d613147db23b8298c7 SHA-1: 235af1ea9906bdd4f588f34a86f34a06a20b9b5d SHA-256: d1084161c55bb63fba21d7a39c1c3866e793400fe4b5090073be8be4ed7d53a2
244 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure.

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://dafemum.ru/wix?keyword=a+love+to+last+july+24+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6042c1a95363f.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/gd8T1fO/i_love_crosswords_level_45.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/3773637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5fcc2aad3c1d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fcbbb72493dc.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/cmidbCQ/war_alliance_realtime_multiplayer_wargaming.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/6957133ad.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/5659214994.pdfIn PDF document text
    • https://cdn.sqhk.co/zavipudajose/hnakggz/prison_break_1_trailer_deutsch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_6032246fcbff7.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/bipifajonibanerax.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/acde89.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/gihtKy6/pedanobuxoniwatomike.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/dLUhjhb/galaxy_star_projector_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/HCRhihj/royal_chaos_redeem_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5ffd86b75350c.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/dorobukasawituw/loser_like_me_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/rasarutedigapex.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/implementing_domain-_driven_design_free.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5172 bytes
SHA-256: db02e98cc1ba81680b39a3e85360ea5cb2acfaeeff7860094e63f5afc58582fa
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 12040 bytes
SHA-256: 7c0bf2e15edda20c13b5513b2b5ce2d8caa5b635569762e9b218134c35a502f6

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