Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04562dc4508b318…

MALICIOUS

PDF

120.3 KB Created: 2021-01-21 01:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3a6c37c3f86af3bff90900d3dbd21f89 SHA-1: aa54a60597ba3e2c4ac83db34606c7406947b26a SHA-256: b04562dc4508b318cad2c79046c5ad281e3d027d95db923f78588d0de51df182
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document appears to be a link farm, hosting numerous URLs that likely serve as lures or redirect to malicious content. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=advanced+cardiac+life+support+2017+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_5fd9ddf375ec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5fefc687e4987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5fb81117d858e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fcd15cbaac46.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/2962688.pdfIn PDF document text
    • https://site-1172276.mozfiles.com/files/1172276/wajugevaf.pdfIn PDF document text
    • https://site-1166701.mozfiles.com/files/1166701/disable_adblock_opera_mini_android.pdfIn PDF document text
    • https://site-1177644.mozfiles.com/files/1177644/xotarebogejevonalewok.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/fivapefonurepigikavobaz.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/225c9bb3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fe83b5d8efd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_5fb4d0dcba400.pdfIn PDF document text
    • https://site-1173833.mozfiles.com/files/1173833/easy_piano_sheet_music_free_for_beginners.pdfIn PDF document text
    • https://site-1178634.mozfiles.com/files/1178634/vufugaxuzin.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/7059258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5fe2ca415cbf9.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/445206.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/4906707.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
    • https://s3.amazonaws.com/fatisake/rifil.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/54573743704.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/causes_of_stress_among_students.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000189e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E5 5488 bytes
SHA-256: efdb6ff0bd3c19157e1be192b4a4831c22084c78dca6a75dcafcd539c2d9f1ea
font_01_sfnt_off00019ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CA5 12104 bytes
SHA-256: 779f4e7845e0215f044e34eb8e8e6c22e78dcae01ada4befe863fc8b488162c2
font_02_sfnt_off0001c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361