Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a3934da7293281…

MALICIOUS

PDF

77.5 KB Created: 2021-01-05 19:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca28abdd28473120196671954ed49962 SHA-1: b541362745d4a265df70bb591566a4d2d45a9b64 SHA-256: 44a3934da7293281ba276dfa5b964636b9ae4b08e0a7aa06938c15435d39b349
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to a potential download hosted on AWS, suggests an attempt to redirect users to malicious or deceptive content. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=horsepower+to+joules%252Fminute
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/9668824.pdf
    • https://cdn.sqhk.co/gadukupuwe/Vju0aBx/betonimixenaluzoxejowula.pdf
    • https://cdn.sqhk.co/sixepatexup/eVlJzha/epl_top_scorer_2019_20_bbc.pdf
    • https://cdn.sqhk.co/rijatazuga/jgejjhf/warewukef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/napisakaluja/dragon_mania_legends_hack_download_free.pdf
    • https://uploads.strikinglycdn.com/files/5b6d5bff-4349-4b67-b447-91f5882c7c42/dragon_city_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/949dd73c-5428-487e-846d-4d5d308693a0/debepuke.pdf
    • https://uploads.strikinglycdn.com/files/a13f50c5-5b1e-41ba-9037-83c017b1bf90/west_africa_map_outline.pdf
    • https://uploads.strikinglycdn.com/files/b91d57c8-ad80-47e0-8bdb-e2f4110963bc/soduwalos.pdf
    • https://uploads.strikinglycdn.com/files/99f625ca-b317-4f52-9c6f-1ed2c74acabb/zenurivixiwewoxirisezi.pdf
    • https://uploads.strikinglycdn.com/files/7f0215f8-cd54-484e-97a4-4e85d86e83c4/stay_with_me_satb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfc.bin
cfd52ac1caf8251dc269450da8b04f53104abdde77a8ba49822a95b0e6373165
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 4920 bytes
font_01_sfnt_off0000ecbf.bin
dc2a5fd6182e2aa692254513a0ace25c538cafe0793aa2d4627a9859bb020a40
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 11464 bytes
font_02_sfnt_off00011413.bin
67bcfb7c388726f5c3b45134396d4daeb52989b52d679508e6f393a01196499c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 16088 bytes