Malicious PDF — malware analysis report

Static analysis result for SHA-256 7263e3269ee74b5d…

MALICIOUS

PDF

99.0 KB Created: 2021-06-01 15:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5a423acc578456a39066c6bf0f1ef04 SHA-1: 8570fa8867157911953751889eb2e66dae69ddee SHA-256: 7263e3269ee74b5d3257cb198b645e1d763a293013cb1b9bd8a6573a26af3dae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=ashrae+cooling+load+calculation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366646/normal_6047c8f5eb40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_605b3f1f8a85a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff4c4c9aa03c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379500/normal_5ff4cabc44a22.pdfIn PDF document text
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/933d702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5fda55c44896a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_600ff7624ce71.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/vopubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_6023d2e521316.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/vimifereloxapap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fee632b68724.pdfIn PDF document text
    • https://titevajap.weebly.com/uploads/1/3/2/7/132741099/5145023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_60661ef5d3ee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5ff379bb6ac88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5ffac3954317c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5fdf2ec213cac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413595/92862161987.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144424242/what_is_the_difference_between_absorption_costing_and_variable_costing_chegg.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/ffg_star_wars_rpg_talent_trees.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 5408 bytes
SHA-256: 0c5c7d9acd5bc5ba48d1cf1d109d4162b0dbfbe7ba93311b01e9fff4fcb8fae0
font_01_sfnt_off0001443e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443E 10840 bytes
SHA-256: 5d86e256faa6d25816a09ba5db00c2d180fb4378d1bc667dcbe1d3fda88ab6f8
font_02_sfnt_off00016951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16951 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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