Malicious PDF — malware analysis report

Static analysis result for SHA-256 294bc9eebb94bd05…

MALICIOUS

PDF

73.2 KB Created: 2021-01-11 13:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 953ea4991e45d6d38bc679ff50406565 SHA-1: dc3732a6cb87623262face193c3eba42633841f8 SHA-256: 294bc9eebb94bd05ff5d153071c1d225ab900925761a8e501c88d1a9267bfb97
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and link farm. The document contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The primary attack pattern involves directing users to external, potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=ap+human+geography+exam+2018+answers In PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/vakabibazi.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/5524579.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/bCkqTic/befulorevewapi.pdfIn PDF document text
    • https://waxutawuvesi.weebly.com/uploads/1/3/1/4/131455398/493774.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/7pxicig/gebipapuraxufabekolowaj.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/golodadeb.pdfIn PDF document text
    • https://site-1168129.mozfiles.com/files/1168129/maze_runner_the_scorch_trials_4k_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5fe4efb616ae4.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/j1zjhja/santa_run_2_speedrun.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/1947b2cb2ce0a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5ffb5b68abae4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 5724 bytes
SHA-256: 3fa0176412b8f591dfd0c48f9fef3adbf71695d08acad82ae4b75f7a92221724
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 10400 bytes
SHA-256: 85700ba53162ccc5a290889750e3be32c1183de40b7af738064a98a44691fe6a
font_02_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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