Malicious PDF — malware analysis report

Static analysis result for SHA-256 850444bf15411834…

MALICIOUS

PDF

144.3 KB Created: 2020-11-11 19:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 11f7a60123b20c5a58d312f52cf91a02 SHA-1: 19f3375a95192fbf6e4e5cd48a8c3242b59b4c24 SHA-256: 850444bf154118346261c7c58493f58e2e769e0e848847a433033af47eb03982
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/123?utm_term=limited+service+campaign+for+vvt-i+oil+line In PDF document text
    • https://mojekofodu.weebly.com/uploads/1/3/4/6/134673543/sukelodoxe.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/vuzedatisonotov-vusutepagixuvag-vutuzeditofofop-vagobozaduxe.pdfIn PDF document text
    • https://lapomuxonadaxo.weebly.com/uploads/1/3/4/5/134584049/d8d2effe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f93b85c1a379.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/64ed39d.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/xoxukuruwajizobivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5f9d6ada98593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f766ddc4-a3a3-44a0-9654-5ce52608edb6/55058273911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491792b9-a891-4c86-bb67-4d51b86f19b1/32634397985.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/edit_mac_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/giwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977724ba-e0af-4ffa-981b-da0ab952b0ed/46758951874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1202bb-9e58-480a-8c43-fc49b2317dd3/46227237562.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_off0001e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E103 5508 bytes
SHA-256: ad4a057d9120e87f9d0fe5a6264074ca38ca1c546e98442dd59b48da8eb7e6be
font_01_sfnt_off0001f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3C3 13088 bytes
SHA-256: 66bb2345cebd9a71a0b3392eb6370078cff50e326d5de05fc10ffa88d166e975
font_02_sfnt_off00021ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EBD 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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