Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c0779e88332ae9…

MALICIOUS

PDF

73.1 KB Created: 2021-02-04 03:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 65e4cbf5578578eb4937c26f43c33d83 SHA-1: 775ee2585df54dbba82a739eb2fe350a0b71ab45 SHA-256: 46c0779e88332ae98aaef5a9fbcd14ea1765e0a80e263d9b58c958b30ce8e899
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of a 'Download Now' lure further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=nook+apk+mirror PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fdcdc5ce39c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477878/normal_5fe0115899cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5ffb8e917e068.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/YoI9Rhb/tivedoxa.pdfIn PDF document text
    • http://kulokozataxat.22web.org/874460879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_600ba64c769ce.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/Fijhdgi/ric_freeman_tyler_tx.pdfIn PDF document text
    • http://sapinatuligoro.22web.org/hospital_incident_reporting_format.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/rilexazejuzovep/mafoganebalovebevux.pdfIn PDF document text
    • http://foripoj.epizy.com/fudijemolijafopi.pdfIn PDF document text
    • http://xujiwusa.epizy.com/cdc_treatment_guidelines_for_gonorrhea.pdfIn PDF document text
    • http://pomigipasa.epizy.com/warejimivesuraxujexifig.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/27812344866.pdfIn PDF document text
    • http://besosive.epizy.com/83266902090.pdfIn PDF document text
    • http://mijikudetixo.epizy.com/newixuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/bac_maths_terminale_s.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/lowesudodevexifar.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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 4272 bytes
SHA-256: c1ad014d63db29a29380e3125cb4de0df6121aa53ee60ec522ae35b8f77f4cea
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 11440 bytes
SHA-256: 7a38fcd8b4db26c8b2b33f9e8f74b7806332158ae8b3f2d70b94b72036490ac5
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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