Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd41f79c40086ec…

MALICIOUS

PDF

87.8 KB Created: 2021-03-17 03:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 32cb9d70175296c51b480d68263c78a3 SHA-1: 398741837cde7babdd4933d790b3fbfa23bbef0b SHA-256: ffd41f79c40086eceb79038c5fa27cecbf7885d1b1e994ccbeeb0ad9a17b0f03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to distribute or redirect users to malicious content. The embedded URL 'https://golowaki.ru/123?utm_term=video+editor+software++free+full+version' further supports the lure of free software to entice downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=video+editor+software++free+full+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366647/normal_603d3805656f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_604354b115b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_60258c1c95648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_601aa32915cd1.pdfIn PDF document text
    • http://gedawirij.66ghz.com/beneath_your_beautiful_piano_accompaniment_sheet_music.pdfIn PDF document text
    • http://kigadotezolesun.mypressonline.com/jean_baudrillard_simulacra.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/27518839798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485813/normal_5fee47c940b6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fdf0e6c87ffc.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/xufujofaleki/93268231441.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_8c4143fe65204dc1a40bf69785deb4d3.pdf?index=trueIn PDF document text
    • http://mikijanux.atwebpages.com/blackstone_real_estate_partners_ix.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/mirakawipumopavariku.pdfIn PDF document text
    • https://924ae364-dc9c-49e7-9181-07aa94c0346a.filesusr.com/ugd/7ab50f_9701479276724900ad0d20b04d88c16c.pdf?index=trueIn PDF document text
    • http://piruxogijuba.rf.gd/wolutukoxona.pdfIn PDF document text
    • http://gajijap.epizy.com/lijupoxawosolavanorebox.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_72c3b593e30447018f03784082ee4ac1.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_2f3a03c502be4973adb488fcdb0a3010.pdf?index=trueIn PDF document text
    • http://jasazovi.rf.gd/vandoren_mouthpieces.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/2_year_planning_calendar_template.pdfIn PDF document text
    • https://423b1922-3b22-4770-a53c-9b76cf3b1ee3.filesusr.com/ugd/1b0481_1194a9a109574f44b69a3f398d0e04df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/sapivavogadikarosemo.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/what_is_bcm_ar_15.pdfIn PDF document text
    • http://lifobem.myartsonline.com/59124677288.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_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 5020 bytes
SHA-256: d1e83c2e9883c244faaddcfdeb322ba63661b715ca36a9b318efb5c0f57261ae
font_01_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 11228 bytes
SHA-256: ec95c0009758e7fd777aca5282e6f906371ce3cd137a895a4cb7bbea5260ad97