Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5318187b21e7d8…

MALICIOUS

PDF

84.6 KB Created: 2021-01-08 18:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0dd2bc2b02446aa3f55b86544c096f95 SHA-1: 081dbb9b52f461c55302f6c61f4688aa4f55d575 SHA-256: 6e5318187b21e7d8f8568d4497748b9d5b8e75c9efc74c16e3fa643e271060d8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=automatic+call+recorder+for+iphone+apk PDF link annotation
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/nimuxav.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/gggEihf/fiji_airways_check_refund_status.pdfIn PDF document text
    • https://luxakanodaz.weebly.com/uploads/1/3/4/5/134589800/50dcc8a2663280.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/bizib.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/a68e9e7.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ricVVlW/ding_tea_athens.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/jgMhihe/pomez.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/ijfhchb/tederep.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/tasopaxora-litonagupuzona.pdfIn PDF document text
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/nuvug_zizuk_budinuzotumo_riruxo.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/d8221.pdfIn PDF document text
    • https://tipujinozubuva.weebly.com/uploads/1/3/4/8/134883375/70f2d03670c60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/country_airport_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/wogatarixepiwosavu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 5272 bytes
SHA-256: 4043743c6b8aff4482071134962963b8e127e8572956a02d53c73ce235bc8f89
font_01_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 11240 bytes
SHA-256: c311d8dcdaf5ccf1b4bb84c22732e915070184f77ed180a44f1735240486e4d8