Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a557f1b6af26cd…

MALICIOUS

PDF

66.9 KB Created: 2020-12-07 12:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f307a7e96f86d0155e37675163b94e13 SHA-1: d2acb57c9053bcc67ea33f476b0af4f7b55f7f06 SHA-256: 37a557f1b6af26cda920eadbdb9410ca2247dab325db60d7bc44eeeffb14c94f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'traffking.ru', suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links are indicative of a link farm or SEO poisoning technique to drive traffic to malicious sites. No scripts were extracted, but the PDF's nature suggests it's designed to exploit user trust through deceptive content.

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://traffking.ru/123?utm_term=troy+bilt+tb22ec+edger+attachment
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5fcdd6f5024ba.pdf
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f8d5d7cb50be.pdf
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5fcd0858041e6.pdf
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f8c07293bdae.pdf
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fa2f65724cd9.pdf
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/b847873b6.pdf
    • https://static.s123-cdn-static.com/uploads/4381766/normal_5fc6cb73a2162.pdf
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f8747a16386e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobovunoberiki/blank_autopsy_report_template.pdf
    • https://static1.squarespace.com/static/5fc5d46edf132613bbdf5b61/t/5fc8dae7a9f67830ca0531d3/1606998759421/8543379259.pdf
    • https://s3.amazonaws.com/memul/songs_my_mother_taught_me_marlon_brando_free_download.pdf
    • https://s3.amazonaws.com/jedobufudajewu/redgard_uncoupling_mat.pdf
    • https://s3.amazonaws.com/luxelula/wajiruduzutaxanolelos.pdf
    • https://s3.amazonaws.com/dekogamik/dashing_cm_bharat_movie.pdf
    • https://static1.squarespace.com/static/5fc1c1fef9866f3fd2da6514/t/5fc71c441d106d256bbbff11/1606884436639/11928353110.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_off0000c797.bin
b10eed8eae6aa756bd9bfbd4a66d23717f95ff4331825d227c0e33c12d6ac4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC797 5496 bytes
font_01_sfnt_off0000da27.bin
3604971199955873c209dccfddeb126e03afda5dd2882c306971518553d803ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10788 bytes

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