Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb9f93c3a78a31f…

MALICIOUS

PDF

78.6 KB Created: 2020-11-17 10:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c153bfa66f4288b75b500ce90abc0e53 SHA-1: d1628c6a61dd4ea551efb5e14d22dd7878b52dd0 SHA-256: 9bb9f93c3a78a31fcf04729e070148a7ec6718b8aeb7b2d2c14312c742591f71
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure and another for a PDF link farm. ClamAV also detected the file as Pdf.Phishing.Trojan. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cctraff.ru/123?utm_term=how+rare+are+faction+relic+data+sites+in+wormhole+eve+online
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/xalupitobapa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wefemabeni/bejeweled_classic_apk.pdf
    • https://s3.amazonaws.com/vasofirida/summoners_war_world_boss_guide.pdf
    • https://s3.amazonaws.com/zevutebulaworel/xodota.pdf
    • https://s3.amazonaws.com/kezemiradigu/free_pc_casino_games_full_version.pdf
    • https://s3.amazonaws.com/xenavuxa/58965707442.pdf
    • https://s3.amazonaws.com/zufojadibi/22041076614.pdf
    • https://s3.amazonaws.com/ruzaganog/muminivitovalewema.pdf
    • https://s3.amazonaws.com/xifabilejilab/how_many_calories_in_a_bag_of_popcorn_extra_butter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f4.bin
56330bd1f2fb79d0b173eb74b7e7e0413cba4cd371b2bc7c2937a0d8e517afce
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 5160 bytes
font_01_sfnt_off0000fb5d.bin
20e4c9a410c3b6770b649b78da57db1fb9ff6ea948dbc1ecdb97fc8993a71ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10484 bytes
font_02_sfnt_off00011f15.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 4324 bytes