Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6da4336538ceecd…

MALICIOUS

PDF

101.3 KB Created: 2021-03-18 20:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9e59f0584a6d5ccae20caca46fd1698e SHA-1: 72960973e868f986838f3fb02b3d4a1990479da4 SHA-256: f6da4336538ceecd75bf0cbe1303f11774dd76163aac8a5f6238143facb0805a
186 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 a machine learning classifier, indicating it is likely a phishing or trojan delivery mechanism. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. One prominent URL, 'https://lozipotod.ru/strik?utm_term=theseus+and+the+minotaur+libro+pdf', is directly embedded and likely serves as the primary lure.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/strik?utm_term=theseus+and+the+minotaur+libro+pdf PDF link annotation
    • https://cdn.sqhk.co/godidudawat/gegfghJ/free_movies_and_tv_shows_on_firestick.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/4igJzic/brave_frontier_mod_unlimited_gems_apk.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/tajajanirepamu.pdfIn PDF document text
    • https://nozatagi.weebly.com/uploads/1/3/3/9/133986497/3663957.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/xejubotejojav.pdfIn PDF document text
    • https://gipazekafasulal.weebly.com/uploads/1/3/4/6/134600210/vefitasolazawe-totubovuvakedi-werador.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/UoOLjir/dragon_snake_care.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/7324537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60262d73aa11f.pdfIn PDF document text
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/kososubiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_6029d2fdace75.pdfIn PDF document text
    • https://jokiwuruxuwam.weebly.com/uploads/1/3/1/4/131437523/zofuzo-vasetiwazapo-gisuvugo-dinoxapatid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_603509c5ba39d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_bf5a2a3a2d724b37b871959d377ea307.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_11264b6c2d444ff3b1f8d91c8324c7d5.pdf?index=trueIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_84f6129b315245f4a6e3b2f3bb5f4824.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_de189129cb714c34855c62da948cd20e.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_43abf975dbd249c48a4a2a9b22d81851.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_530223b420464018b00ab5443c488199.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 5372 bytes
SHA-256: d60919337f1d9c998e71c7c0561a0bb573e6c5e8505db54abc4b82a85ccb312e
font_01_sfnt_off0001404e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 16856 bytes
SHA-256: b1637b507041fc5c1ea288205c21f5cc0e22599569c65c808e327396ae2091fc
font_02_sfnt_off0001735e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735E 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1