Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd861386b7a8799…

MALICIOUS

PDF

69.3 KB Created: 2021-01-27 14:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b9f706115dff7a054f3f9b159501e8d SHA-1: f6db9dc9b6477dfcf7849cc5b86594499f290f47 SHA-256: 8cd861386b7a87996d53df061dff084289cbc8d907aca2c54bad61738831a5f0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The sample also exhibits characteristics of a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link redirection capabilities are indicative of phishing or scamming activities.

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://ggtraff.ru/wb?keyword=cardboard%20fireplace%20christmas%20decoration In PDF document text
    • https://bifetidenogu.weebly.com/uploads/1/3/1/3/131379340/rurigu_zumoz_wekafobo_majura.pdfIn PDF document text
    • https://rokaxitifefisol.weebly.com/uploads/1/3/4/0/134040577/fcb1ccbc92b.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/dummy_escape_literaturex1cd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5feeda306f3bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_5ff5233a0b445.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/fexemomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexenejo.epizy.com/97171321077.pdfIn PDF document text
    • http://jumezezufa.rf.gd/form_g-_325a_biographic_information.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/10_day_green_smoothie_cleanse_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/intermolecular_forces_vs_intramolecular_forces_worksheet.pdfIn PDF document text
    • http://palomidifigur.epizy.com/inferential_statistics_study_guide.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/57239279260.pdfIn PDF document text
    • http://kariwukopufemu.rf.gd/5892221028.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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 5440 bytes
SHA-256: 298af12555c8445eabf5b8e5a8fb238d14c2c15b43399b4f0318a260cc51e5c4
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 11300 bytes
SHA-256: 380819924e99d43f04cffe839de7eea6909a9f0889ebd89680d3d41b979b6e62

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