Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a971b194950905…

MALICIOUS

PDF

73.6 KB Created: 2020-11-23 12:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ce8c70526d4db3467b16ebd7aab29e6 SHA-1: d5b6f71a4ade29ad58053ef03e97272072968bd4 SHA-256: 43a971b1949509054637bd6e21991db4dd2614eb192650c428d4a6c049018303
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 S3 buckets with seemingly random filenames, suggesting a link farm or content distribution network for malicious files. The ClamAV detection and ML classifier strongly indicate malicious content. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM rule confirm the intent to direct users to external resources, likely for further exploitation.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=easter+activities+worksheets+for+kindergarten
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/7931455.pdf
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/kadizepupinil-ribefumezabaxew-jedumezesasokol.pdf
    • https://widavobixi.weebly.com/uploads/1/3/4/4/134494271/xupadimavazura-potegugojiso.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/xituxojelamew.pdf
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/fawaf_fekiwok_mitokos.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/gemam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dejazuvorira/77929613834.pdf
    • https://s3.amazonaws.com/vesubodufisi/96688521469.pdf
    • https://s3.amazonaws.com/sinamozagemoger/chatuchak_market_bangkok_map.pdf
    • https://s3.amazonaws.com/kimoweworape/81988162783.pdf
    • https://s3.amazonaws.com/nokiva/hunting_and_fishing_games_unblocked.pdf
    • https://s3.amazonaws.com/vukusa/reddit_tinder_profile_guide.pdf
    • https://uploads.strikinglycdn.com/files/eb91aa91-d708-42ba-80c1-7702d37e5f74/68381704631.pdf
    • https://s3.amazonaws.com/wanalovum/natejutukeviwutolewosif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d9.bin
274af9945bdb6e6f9104993e68ba2a18075fc7942b56fd786166e7fb053393b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 5424 bytes
font_01_sfnt_off0000d75e.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 1800 bytes
font_02_sfnt_off0000dfeb.bin
98b5832ce9780d7f65435f71668244d68782c925727d0f53c4e05756dc1eff9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10300 bytes
font_03_sfnt_off0001035a.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 16312 bytes

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