Malicious PDF — malware analysis report

Static analysis result for SHA-256 9354c3e9f241bb1f…

MALICIOUS

PDF

110.1 KB Created: 2021-05-19 02:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf3e19fe769babc41524c93368d160b7 SHA-1: d078156529601f19241f4b14daf94ecb3a9698e6 SHA-256: 9354c3e9f241bb1fae7af0b5dd614a1bfdf6f3ac05f808d24980d41efcfb437f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=my+hero+academia+movie+two+heroes+crunchyroll
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5ffcd933becc1.pdf
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fec2f031a794.pdf
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600bc9f9763a8.pdf
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/9557e679e740dd.pdf
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fed98c916e62.pdf
    • http://wopafopu.22web.org/74445306468.pdf
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/6161742.pdf
    • https://cdn-cms.f-static.net/uploads/4406170/normal_6064b96a42607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotitibekovi/wosixupurixure.pdf
    • https://uploads.strikinglycdn.com/files/8c0b6827-4d61-4f04-98bf-656c61290e63/die_unendliche_geschichte_2_film_stream.pdf
    • https://s3.amazonaws.com/sagotomagin/chol_gori_all_song.pdf
    • https://uploads.strikinglycdn.com/files/001e1ae5-eea2-4ff9-9243-abf75a317c49/how_to_be_a_medical_lawyer.pdf
    • https://s3.amazonaws.com/vatosolikijike/28714515558.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/88635053362.pdf
    • https://s3.amazonaws.com/rekawexuretowo/42633528201.pdf
    • http://segixof.epizy.com/fosupep.pdf
    • http://rewogaki.rf.gd/putodukuvuf.pdf
    • https://s3.amazonaws.com/gupawupigawono/thom_hogan_nikon_d500_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001077f.bin
ac8524441331dc58a890a6a17a9e585a7d03b804d8a7588ffb10323ae17ac577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 20040 bytes
font_01_sfnt_off0001483e.bin
a27593e5649a63897a6476add0404888bf23a3f96b4f5018cc72711cb62946b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1483E 5436 bytes
font_02_sfnt_off00015aa7.bin
96a2a01817ffd31e1e64a008d044e1e6f0bbca1d301456dc12dea17b95256095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA7 3688 bytes
font_03_sfnt_off00016965.bin
0f27589627c40338caaa0de2170a6ce25028a17e8112ac07751680d5a72cb4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16965 12524 bytes
font_04_sfnt_off000192bf.bin
eeca44c55437122252130aa3623aec2651c87b44620ba05bdcc71fb5df377d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192BF 16232 bytes

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