Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9af622899599a8…

MALICIOUS

PDF

63.8 KB Created: 2020-11-21 07:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d0cdee7a1b26ed82edb7671fa103a5 SHA-1: bac065d39845915cc177609c672d9696b4073164 SHA-256: 0b9af622899599a84cbdc94c4b0c73a21bdc4969e6f727cacc305e2f35b01fe5
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous external PDF links suggest a phishing or link-farming attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=warriors+coaching+staff+2019
    • https://dojenamolusojow.weebly.com/uploads/1/3/4/8/134868247/937aa25.pdf
    • https://bexunofa.weebly.com/uploads/1/3/4/7/134721512/timufedin-xilezibenamuj-xiworux.pdf
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fb45f38272a9.pdf
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5fa69c854d6ed.pdf
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/ec4df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padoragog/91190564263.pdf
    • https://s3.amazonaws.com/vogubivajavofu/mideset.pdf
    • https://s3.amazonaws.com/vukusa/20334056571.pdf
    • https://s3.amazonaws.com/jebokizez/free_workday_payroll_training_manual.pdf
    • https://s3.amazonaws.com/kijelopazekune/algebra_tiles_printable_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/5ede2970-fcde-41d1-87d6-8f7e25491105/50236050772.pdf
    • https://uploads.strikinglycdn.com/files/192349f2-b001-499e-bef5-5f29456da95a/37048451967.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc2c.bin
f4fa17d9c8eb0b0c174578279e6542e7a6beeb07c98e5691115ec1276c623324
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 5604 bytes
font_01_sfnt_off0000cf4e.bin
bcf8e7c194d3289c24c6ba6edd728bbb7d02f2e1923596ed1b4b00c2073cbd7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 10444 bytes