Malicious PDF — malware analysis report

Static analysis result for SHA-256 04442316cf2bff15…

MALICIOUS

PDF

75.1 KB Created: 2021-02-08 14:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 708dd7fd588bf05be28f01c4820536ed SHA-1: d0087fce3feb90098b11cd64cbd7cdc13485a779 SHA-256: 04442316cf2bff15331a92305b70b28428e8c33e43aef4d7bbca3a89350cd7b1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of malicious links strongly indicates an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wb?keyword=android%20arraylist%20contains%20custom%20object In PDF document text
    • http://gaydating.world/309732423408oi73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fed12658e66c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fcccf2c941ec.pdfIn PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/4502168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_600dfccab5049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60195234ab468.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/DxjahjG/70735646553.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/jaZwuje/paforebiponiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5ff07a76d5cf4.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/5bjeQgi/where_do_adverbs_go_in_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5fc89353dca48.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/iGvY2je/castle_defense_knight_fight_apk.pdfIn PDF document text
    • http://wamawebikojas.22web.org/sarepewureguzuzobexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebejokepekizuz.rf.gd/binomischen_formeln_rechner.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/xavolifowu.pdfIn PDF document text
    • http://panafinuniro.epizy.com/maxebejoxepivofolavet.pdfIn PDF document text
    • http://lunofalogejutu.epizy.com/c_function_template_specialization_in_cpp.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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 5392 bytes
SHA-256: 1307f92829c851ba7b79961fe2cc768469f297bac6b36eb09d6433704b48bde4
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10768 bytes
SHA-256: 3eeda5788b519309567d9fe0278cc3e3b131fc6784752a45d9d7ce4b5ae19b9b

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