Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9baa69258b5e54e…

MALICIOUS

PDF

66.9 KB Created: 2020-12-21 09:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9d3e68bbc89d629f23fc8ef5d2724172 SHA-1: 9487df1d9313343430d94ec30b9329a4204fea82 SHA-256: c9baa69258b5e54eaf085aff73ca38812c33ebcfc936ec232aa5ebeb2a6d544c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains embedded links that point to known malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this sample as malicious. The document body, though truncated, suggests a lure related to health information, likely to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=small+clear+bubbles+in+urine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fb4bf4ed23bc.pdfIn PDF document text
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/5246831.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/b128330071087b.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/molub_rakifa_dirozadofi_girebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fce7122cc874.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/fovubukoduved-mekur-vasazilivapuxok-bavukatajimoje.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/1847461.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/jikusadekobinarozag.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/gusulogimubu_namarunux_vekonagujaloju_modutube.pdfIn PDF document text
    • https://ponejibuwefugep.weebly.com/uploads/1/3/4/8/134879986/ladejuzajepowuk.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/firigugixujotov/pegibajufi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffcc36609fd0ee78c2f31/t/5fc0dd1964571256545babfb/1606475037792/pearl_jam_stickman_fabric.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb77cc464b41678cc2762/t/5fdce468d7bdf26643615493/1608311913233/14952863076.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/61349031030.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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 5188 bytes
SHA-256: 396c9b52a805b6cd3fe09453273ba622b0b0bb4eb0685f09ea68fc84c333b4cc
font_01_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10616 bytes
SHA-256: 1e1b92845b6f9e6330cb1b2e8225e867dc09627d6b2175be14dc6a59e8f43cf8

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