Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1c251640913457…

MALICIOUS

PDF

67.5 KB Created: 2020-11-23 20:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f8f2c10865a754ee3eab7ccc5b9a6a SHA-1: 155c7dcc30f5d0b82006093ccd43eab941390cf0 SHA-256: 6c1c251640913457337f509744a244aed9858dd3b856bf93590f7e33cf8a5120
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=spectrum+sharing+in+wireless+networks
    • https://penaletaxexek.weebly.com/uploads/1/3/4/8/134886030/2103078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kevava/i_am_aldolpho_sheet_music_free.pdf
    • https://s3.amazonaws.com/ruzumeb/botidenub.pdf
    • https://uploads.strikinglycdn.com/files/91f61257-cf73-4597-82b1-5d1f4cbc5c12/14708682851.pdf
    • https://uploads.strikinglycdn.com/files/3df9a127-2279-4f20-a0c9-f41c217f8dae/the_weeknd_starboy_mp3_320kbps.pdf
    • https://s3.amazonaws.com/midipes/24889784323.pdf
    • https://uploads.strikinglycdn.com/files/556aa070-f068-4946-a76b-abb502860447/82695275007.pdf
    • https://uploads.strikinglycdn.com/files/7af573e0-59b5-40c3-9f04-bf5e00cd50e7/zepaniwusifilimuguwijow.pdf
    • https://s3.amazonaws.com/vogubivajavofu/mason_ohio_directions.pdf
    • https://uploads.strikinglycdn.com/files/52c44808-37d6-4606-9b53-f6d90d5fd008/paradisus_palma_real_royal_service.pdf
    • https://uploads.strikinglycdn.com/files/4d58d98c-36a8-4fd4-8ad5-f678f7f27e07/62601665378.pdf
    • https://s3.amazonaws.com/mefadedosuw/nogutenagovob.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_off0000ca82.bin
5ceb1a63a1803c685ae51e4c363f44ba6fc2452322689ce7daa8aa6b9a9a4f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 5604 bytes
font_01_sfnt_off0000dd79.bin
385b522dcc3b4b1bf107c99cc6163f1794b74078770f8fc08478708835f66a94
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10632 bytes