Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1664aa65b2d6c47…

MALICIOUS

PDF

72.0 KB Created: 2020-11-14 03:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b2b7c7690536ada1745b69f4cc0ca197 SHA-1: ec9f66d3aac0dbed25069e07efaaab9297b08b50 SHA-256: a1664aa65b2d6c47cce2c0d1ba4edf14e633dfbd508c4255af532306594c4c36
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or scam attempt. It contains a link farm with numerous external URLs, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains keywords related to hacking router login pages, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=hack+router+login+page+android In PDF document text
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/zunoloridu.pdfIn PDF document text
    • https://donixefafara.weebly.com/uploads/1/3/4/3/134310569/8948463.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/mowuruzovem_rasij_lakupako_madikomojuzom.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/bavuvimufobetun.pdfIn PDF document text
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/ed2916418.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/bugowo-jawadajatixeraw.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/6bcdf533f9658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9540313-2965-4b65-97ee-5b0490868f7e/gagetupikarolodoru.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/desventajas_del_aprendizaje_significativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5bec6e-2495-455a-87ca-f23a84f084f7/fccma_2020_winter_institute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98525672-e8bf-4da6-8a80-45f89743615a/mixoduzoteb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 5088 bytes
SHA-256: 107d61170412520c66aabee8dc17238b1104524751bedecbdb5ad7f8de4d41ee
font_01_sfnt_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 10872 bytes
SHA-256: d3cd89ce7c2a8b372de80b4cc6ed282ae7fe557f66a930e2ea48a773ac44e07f
font_02_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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