Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5974889bbc49818…

MALICIOUS

PDF

84.5 KB Created: 2021-02-22 13:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6667f79b51e5c5da328482ff820ee13a SHA-1: 5adc442566ac9d56a3a33c407a9a9971a13ba3ef SHA-256: f5974889bbc4981875ee5c65cc7e31692026d643c564fc958e9667ce4865d68e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain search-related terms, possibly as a lure.

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
  • 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://druttle.ru/strik?utm_term=how+long+do+kenmore+elite+refrigerators+last PDF link annotation
    • http://zalofamanaw.22web.org/padotofesub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459926/normal_602673f50b492.pdfIn PDF document text
    • https://farejebizaf.weebly.com/uploads/1/3/0/8/130815013/231bc81d52.pdfIn PDF document text
    • http://waneboto.66ghz.com/camera_apps_2018_android.pdfIn PDF document text
    • https://wejilosadala.weebly.com/uploads/1/3/0/8/130815097/refep.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jetijia/99554051807.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/lekona-jinowewediwi-mubimoj.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/guduwabeso.pdfIn PDF document text
    • http://pidivumik.22web.org/cannot_delete_gmail_account_android.pdfIn PDF document text
    • http://pefipegukanijel.22web.org/champakamala_video_song_free.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://fusarafabar.epizy.com/85895751216.pdfIn PDF document text
    • http://dopisudul.epizy.com/consumer_reports_subscription_cost.pdfIn PDF document text
    • http://wanikokod.epizy.com/81041689131.pdfIn PDF document text
    • http://tewalilakoj.rf.gd/2012_jeep_grand_cherokee_overland_5.7_hemi_for_sale.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_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 5132 bytes
SHA-256: 2d961c463de48a55e8513e3d57bce0f8c7a1769c930c469603946ffe5d1922f1
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 11436 bytes
SHA-256: 2f618b22420e35a100e6d6bdcd372bebced3e3d4faca15d7b2717618079d89b2
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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