Malicious PDF — malware analysis report

Static analysis result for SHA-256 f637d7169098b0e4…

MALICIOUS

PDF

69.1 KB Created: 2021-01-18 07:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a55bd6ff5024493d3612edf2da18fb85 SHA-1: de86d39427fec8db35ca59c1021e9bd90870b472 SHA-256: f637d7169098b0e4bb67f805c3b4babe0e1d4f2a99e568dfcde74b393bf20b3d
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest an attempt to direct users to potentially harmful external sites, possibly for phishing or malware distribution. No scripts were extracted, but the structure indicates a malicious document intended to lead users to malicious infrastructure.

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
  • 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://traffine.ru/123?utm_term=canoe+pontoons+homemade In PDF document text
    • https://cdn.sqhk.co/wenegifuteg/ffzijTP/the_diplomat_magazine_dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5ff6842d748a5.pdfIn PDF document text
    • https://site-1201795.mozfiles.com/files/1201795/90095905525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5ffc3649d0e2f.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/2jho0QD/gorodenimajofekanisu.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/aKgeeMZ/super_adventure_rockman_music.pdfIn PDF document text
    • https://site-1212417.mozfiles.com/files/1212417/2003296962.pdfIn PDF document text
    • https://zibubelufi.weebly.com/uploads/1/3/4/5/134517595/3748282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366647/normal_5fef3a6357eb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jb57Jic/32421933762.pdfIn PDF document text
    • https://site-1168233.mozfiles.com/files/1168233/89310436428.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/32fc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajivuselome.epizy.com/86858889805.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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 4976 bytes
SHA-256: 1a8a35a389045a88ce3a53a3942c019675704ab6ac293288f0eca9a5f35d0265
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 9756 bytes
SHA-256: 196438958c7f46ffa54bb2228a11c900df98161612fa589f077051a3fea05dc6

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