Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aa5e3ac87a51cf…

MALICIOUS

PDF

78.1 KB Created: 2021-03-03 17:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ded72b150815164be64ac45d8be917e6 SHA-1: 2fdaf948b3432f13c3fc13b6ba1621d4b1117ee3 SHA-256: f0aa5e3ac87a51cf2f7ec7bde3de9e1ed4335a940f68cbf459ca4a5594864d5d
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, many pointing to disposable domains, and one prominent URL related to 'how to hook up a stackable washer dryer to a sink'. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious websites, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+to+hook+up+a+stackable+washer+dryer+to+a+sink PDF link annotation
    • https://najememate.weebly.com/uploads/1/3/4/8/134867979/dezabedone.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/jgvhjgh/windows_10_video_editor_fade_transitions.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/how_to_make_your_own_car_battery_charger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_600a11cb5a6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_603e3793680e3.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/pggiagf/56803435411.pdfIn PDF document text
    • http://talkme-news.info/iec_61010_1ty6r4.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/7414792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_5fd80aebe3e9a.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/9krhbij/basketball_legends_unblocked_66_at_school.pdfIn PDF document text
    • https://fukukajapojuj.weebly.com/uploads/1/3/2/8/132815924/2846382.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/73694826322.pdfIn PDF document text
    • http://netewe8.xyz/mixorunidexuvusutawum3lu4d.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/hdtjchi/heartstart_hs1_replacement_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_6029d232de0d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/vimog.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/land_rover_defender_110_td5_workshop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/mexiwejivasoxewaturo.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/rexuropogovupol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5520 bytes
SHA-256: b674d0e6497b8e328711a331eb1d5e4283b96aa96689c9d6c0150e1d33138b17
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 10416 bytes
SHA-256: 6bcbb570e8ee97b7ad98dfe63d6c2ae5f49bff94290bd44f27496ec9797a784f

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