Malicious PDF — malware analysis report

Static analysis result for SHA-256 355f1bb46b64a02d…

MALICIOUS

PDF

77.4 KB Created: 2021-04-06 02:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efd368d6b487c2b66e10b6b280d91348 SHA-1: 29d3a86cded94c6c8ab58c748b67f89e2f76a9e8 SHA-256: 355f1bb46b64a02d569db34b21c8bb5b89d2b6896a880734ec9c8baafb8602a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=honda+em500+generator+repair+manual
    • http://lufijep.iblogger.org/98355764060.pdf
    • https://napowokomedisuf.weebly.com/uploads/1/3/4/3/134379523/pomisugijenedam.pdf
    • http://zdorovie-vashe-vse.xyz/badrinath_movie_songs_free_naasongs5ha86.pdf
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/nebadoli_favisedesejuba.pdf
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/e3dc0abfd33.pdf
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/9bc2f4ab0b0.pdf
    • http://itagreen.fun/65404077098683np.pdf
    • http://movigakamemik.22web.org/kujitofajukupuzobizimej.pdf
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/zerem-vefipipazi-tivuxovowiresu.pdf
    • http://supernefritroller.xyz/texas_food_handlers_course_answers6gy0c.pdf
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/9126448.pdf
    • http://bcpzon4segurabetaviabcp.com/how_to_make_an_outline_for_an_informative_speechuodgj.pdf
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/kixebile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakusineba/methodist_choir_songs.pdf
    • https://s3.amazonaws.com/jumedemimo/55995433650.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_9ae0d36faf5947638f0fd5b8b0eefd72.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_5969006a9b1a4e5989899aa6726ce165.pdf?index=true
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_b2383e17fc854662ae24f342a281598c.pdf?index=true
    • https://s3.amazonaws.com/lewuli/dikikiraselimepemutowafu.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_off0000f025.bin
99c8f0ca618863b60ab3c6d5752aaf7aa262053d22346b8a97bc406a54070080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 5328 bytes
font_01_sfnt_off0001022b.bin
dd863a6af89e7fc9d1098333b5a2a49cca57c51ff23b7c97453347879c6d70ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 11400 bytes

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