Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a67f95ff3304013…

MALICIOUS

PDF

81.4 KB Created: 2021-05-23 01:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e7720f1d92f04eb7ef81255ab8de302 SHA-1: 79352c09380961ddcd32d6feb8296053c1cf0b44 SHA-256: 8a67f95ff33040136a444f3ae4424875832f3f3201ac18a6369729a6c406dfa8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'https://dugedepap.ru/strik?utm_term=what+are+the+theories+of+disease+causation', is suspicious and likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=what+are+the+theories+of+disease+causation
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/f89cb4ede4743b0.pdf
    • https://dikugero.weebly.com/uploads/1/3/4/3/134356342/dugoriluxa.pdf
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/15d318f.pdf
    • https://kudoxere.weebly.com/uploads/1/3/4/5/134591480/vesopiguxareso.pdf
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/vajebotap.pdf
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/kalugolakem.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/2946166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/80c50888-7b91-4efa-8e67-fe8bc0abf190/matikow.pdf
    • https://s3.amazonaws.com/bitajemisajoz/cadence_orcad_pspice_9._2.pdf
    • https://uploads.strikinglycdn.com/files/c50c22c8-aa4d-439e-a6d2-443fc980e360/how_to_start_an_incident_report_sample.pdf
    • https://uploads.strikinglycdn.com/files/99d9372e-8bb4-4287-9b46-0a9493a98610/19261715111.pdf
    • https://uploads.strikinglycdn.com/files/86376261-f36f-40af-bcc7-62a92e0304e9/garmin_nuvi_3597_review.pdf
    • https://uploads.strikinglycdn.com/files/eb5f2380-82dc-4c0e-a36d-ce448a66870f/63977701640.pdf
    • https://s3.amazonaws.com/daraniwekamidir/logical_song_piano_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/d579b91f-54ce-48c0-ac56-6ed1f6b8de9f/59878862562.pdf
    • https://uploads.strikinglycdn.com/files/6074cd4c-04a2-4855-b77c-27ff72d7a146/nakimufinutola.pdf
    • https://s3.amazonaws.com/liluvad/96381530966.pdf
    • https://uploads.strikinglycdn.com/files/eb5ff067-f164-4c4a-a833-c6e60e54508f/fubofudojutafiravi.pdf
    • https://uploads.strikinglycdn.com/files/4a9adaaa-927d-40f1-b714-f0b830ba177d/70984221314.pdf
    • https://uploads.strikinglycdn.com/files/b9ac17c6-2bfb-4b88-bb3d-c028b24eb292/9944253635.pdf
    • https://uploads.strikinglycdn.com/files/62a2c786-34e9-4167-a6c6-79c17314ce19/7621477852.pdf
    • https://uploads.strikinglycdn.com/files/5e800c74-bd82-455a-9be8-a10b5517058b/batman_comics_for_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100da.bin
0bfc8f14b45b1fe712da446a0d9410e36ed2075a4b2ee811609b459a22c7240e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 5088 bytes
font_01_sfnt_off00011231.bin
272199dd53618da6ace671b8468bbb893a966fe358df1648090388c250e6dc9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 10956 bytes