Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd1f0aa09c42044…

MALICIOUS

PDF

68.4 KB Created: 2020-12-18 03:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfcc469859b5d1d5dd73816209093ff3 SHA-1: bea629040ee00440e7a53a81d1e96898b180713e SHA-256: 9bd1f0aa09c420445a8982589a21c8947d7d455f48283cbb300e15506e0c542b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'trafftec.ru', which is likely part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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-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=chrome+extensions+adblock+android
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/2768671.pdf
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/037b7c2960b255.pdf
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/9013956.pdf
    • https://zafapajesat.weebly.com/uploads/1/3/0/7/130740498/4256235.pdf
    • https://gugimamerid.weebly.com/uploads/1/3/4/6/134606591/8867273.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/jijibigeko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc6f864d2523e4b70bf1a10/t/5fceaea07bca2b4c4f2e721b/1607380641283/paboneseramiret.pdf
    • https://static1.squarespace.com/static/5fcf5a13cd9942793f279433/t/5fd61ee8ab1a676c7285da9f/1607868136637/jevixekof.pdf
    • https://static1.squarespace.com/static/5fc27b6fdf132613bbc7a91a/t/5fc3d09ce6d49a06bb071d16/1606668445074/rockler_t_track_table.pdf
    • https://uploads.strikinglycdn.com/files/a153ba80-9b4a-4615-9bd2-9bdf8fe4e021/statsictics_2015_mc_secure_exam_40_questions_answers.pdf
    • https://uploads.strikinglycdn.com/files/6e2926f9-0587-4c27-9df5-d651f51bfc37/monster_graphic_novel.pdf
    • https://uploads.strikinglycdn.com/files/eebef3fd-3f98-4d9a-934a-8b5fd555f0ac/61590072156.pdf
    • https://uploads.strikinglycdn.com/files/c19ee5b1-e1ee-4cdc-92e0-1b999a67f39a/vinitefase.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_off0000cfdf.bin
fc42c26bd35d081edfab1c38f5e0ececceba98013d6acb612984367c1b02908c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 5356 bytes
font_01_sfnt_off0000e1de.bin
88fae143143416392661fcb7e2fdd81a0ba850c73dd706aafaf23d02ffbc3de2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 10224 bytes