Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09cdad2f00ccd30…

MALICIOUS

PDF

80.4 KB Created: 2021-01-23 11:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c90d5c4e92c7c21cfa6e3cfbcc31aa9d SHA-1: 7a7b8a103887275d35d3ad7164f69423cb7745b3 SHA-256: d09cdad2f00ccd30c251040f3dc14d65a0a8bdc674b1f678fae1fea262fbd4d9
184 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that point to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of malicious links is sufficient evidence of a malicious attack pattern.

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/123?utm_term=fire+emblem+randomizer+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fdbe6b291dbf.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/6pXqYji/moto_racer_3d_game_free_download.pdfIn PDF document text
    • https://site-1178452.mozfiles.com/files/1178452/camp_rock_full_movie_free_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5fe7451da4069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5ff9a56ddf4ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fe9ccdc92c00.pdfIn PDF document text
    • https://site-1261930.mozfiles.com/files/1261930/nixejumuvatu.pdfIn PDF document text
    • https://site-1168507.mozfiles.com/files/1168507/combi_word_meaning.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/5403383.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/f32c2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fed465468212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5ff280f61d59e.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/pukiza/financial_accounting_definitions.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_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 4936 bytes
SHA-256: 523481fb6d7b3bcea39ebbc046674f04dee4c075f1bdf9c6bf0708cf16abbaa2
font_01_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 11016 bytes
SHA-256: c0ba4a55ab74b6c45d7b929a4b82c903fe145f958ba156011eaabb973607b250

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