Malicious PDF — malware analysis report

Static analysis result for SHA-256 36edb4785e760150…

MALICIOUS

PDF

70.2 KB Created: 2021-02-21 05:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a4c04f291cb65f0cd3dc1e32ebcf009e SHA-1: c29b9b94776a4efa131830627e92586c9ebfd072 SHA-256: 36edb4785e7601507a0acc42e20bb1c092da06d378b74da3cba07add788dc595
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://jacksth.ru/strik?utm_term=is+procreate+for+pc', is likely part of a campaign to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=is+procreate+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488574/normal_600a0c5b4d272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_6007e357e81ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5fd7939fc94ef.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/73341.pdfIn PDF document text
    • https://merogowaxoku.weebly.com/uploads/1/3/1/0/131069891/c65df68.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/nefit.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/virajali_kifakibav.pdfIn PDF document text
    • https://cdn.sqhk.co/japedovak/idHjgKF/beastie_bay_magic_word_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_5fdc5c1ae4702.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/41e65a74.pdfIn PDF document text
    • http://kekebum.22web.org/free_spreadsheet_app_for_macbook_air.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_602a1bcbae155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470020/normal_5ff355897fcd9.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/jggiigX/steel_pulse_true_democracy_blogspot_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hfhijgJ/2_points_slope_intercept_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 4916 bytes
SHA-256: 85cd1eac65236d94eeb70c4975d52b3fcf0d99d97b54bbfd274285bcc35cfa68
font_01_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10500 bytes
SHA-256: ba127b5296d900c12c28e0e245a76fdbe205b2f15eb26fbd01096de3fd1c9f96

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