Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ee5afd2e6c03c…

MALICIOUS

PDF

79.1 KB Created: 2021-02-24 08:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7bb9e4eb5f9b2ad3428db030ea0cb5a1 SHA-1: 7285e04e3fa1fdc7b2a710b88d8fe469b5a538af SHA-256: f89ee5afd2e6c03cd77081fbe92a04a6bca91bfc39b3070d807b58358159cee6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=lean+manufacturing+techniques+pdf PDF link annotation
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/a4646a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600c37af174f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6010c649d449d.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/lutavagetafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_600fd59e721f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60292441f09dd.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/7089593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_60347aad5be45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6014405597453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fe6b9ca046b6.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/difigomisosak/s_a_d_love_wallpaper_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/53984612845.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/dd_spells_level_1.pdfIn PDF document text
    • http://tejujusaruke.epizy.com/bavobuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/greenhouse_gases_and_their_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/66935402016.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/agreement_of_subject_and_verb_exercises.pdfIn PDF document text
    • http://lowebabufi.rf.gd/zasawiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/jofudavifavazuxofaje.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/cid_video_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/inorganic_chemistry_by_jd_lee.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_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5604 bytes
SHA-256: 0cbcc2607c045036195cd96121dc04d971689958f0cbc61afe9de4f007e3b659
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10684 bytes
SHA-256: a1a4db022c107865ef6305139842d073774d804b0d276992601290e6d85bdf35

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