Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f6ce70888dd9c1…

MALICIOUS

PDF

68.3 KB Created: 2021-01-10 00:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7994a7e91a32a87289e3ce64256da87a SHA-1: 3bf28166e8fdf219018dbcbaaebb42ca7c5b8e09 SHA-256: 18f6ce70888dd9c1ee953160ba7edb1df82d80b753785aff3f51eff0ee5986b1
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's part of a link farm designed to redirect users to potentially harmful content. The embedded URLs, such as 'https://cctraff.ru/aws?utm_term=beko+fridge+freezer+manual', are linked to known malicious redirector infrastructure. The document's structure and numerous external links hosted on disposable domains suggest an attempt at SEO manipulation or distributing further malware. No scripts were extracted from this sample.

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
  • 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://cctraff.ru/aws?utm_term=beko+fridge+freezer+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5fcaca6f2fa8d.pdfIn PDF document text
    • https://gijakumode.weebly.com/uploads/1/3/4/3/134306186/6889441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f941603107b1.pdfIn PDF document text
    • https://site-1178980.mozfiles.com/files/1178980/maxxis_tires_review_tsikot.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/kekejutokezatigu.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/8831898.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/5851646.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/alpha_helix_beta_sheet_structure.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/tapuduzimevofodavi.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/80a2dd.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/NicZhgg/idle_tap_racing_cheat.pdfIn PDF document text
    • https://gesemobi.weebly.com/uploads/1/3/0/7/130738939/sazizol_duraxowamuza.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/pugiwotole_penudipopupuj_xanaxedubu_zuzusidel.pdfIn PDF document text
    • https://xapugugividus.weebly.com/uploads/1/3/5/2/135298581/3616239.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/jjhiq4Y/go_karts_houston_indoor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fc45bda00f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B3 5012 bytes
SHA-256: f96f498a900b02237d77d62ff5fbd2884799389dd6927a9c9d7d39c705b97658
font_01_sfnt_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 9640 bytes
SHA-256: 9618bbc4844c59cce565ca1df77fb586ee4545c2999331c10a8edd374a896689
font_02_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361