Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee9fe462f1c432c…

MALICIOUS

PDF

89.6 KB Created: 2021-02-28 15:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a975b5ae67745f00bb0fa71561e3d16c SHA-1: 055951cd2bd1d0930e0ec2a7788ee9a1d1b2aceb SHA-256: 3ee9fe462f1c432ca34df507a1fb8b08dc23f2b8c4ddf660e7cc3a0d54d429b6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain ('resalured.ru') and containing a search term related to common household issues. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the heuristic flagging it as a link farm on disposable hosting suggest the primary purpose is to redirect users to malicious content.

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/123?utm_term=how+to+stop+smoke+alarm+from+chirping+first+alert PDF link annotation
    • https://fobopalok.weebly.com/uploads/1/3/4/4/134401292/606029f75bc.pdfIn PDF document text
    • http://heretythere.site/dash_diet_phase_1_lunch_ideas40cl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fd7db7636908.pdfIn PDF document text
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/8599683.pdfIn PDF document text
    • http://hookup157.fun/how_to_write_a_process_speechog6mw.pdfIn PDF document text
    • http://vitedotom.iblogger.org/stalker_game_pc.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/5543385.pdfIn PDF document text
    • http://wofeboz.66ghz.com/weather_report_tomorrow_in_mysore.pdfIn PDF document text
    • http://gallery-shop.site/99087169096x1cj1.pdfIn PDF document text
    • http://wojisub.mypressonline.com/how_i_learned_to_drive_script.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/pofazeguxusuxef.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/luruf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/anime_face_maker_app_for_android.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/jinebetusatudiz.pdfIn PDF document text
    • http://woranuganavot.myartsonline.com/fitopuzunemefakiwefiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/fikew.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/muziz.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/the_republic_of_doyle_location.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_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 5548 bytes
SHA-256: ecfcbcd5fbfe86bdc76e72acb2b2f14f125155fe625fe68106fc542fb1ebf361
font_01_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 10540 bytes
SHA-256: 93ac5af3409a60d4179093d560ebf63df10002a136411fdcd9a338c06d0cf87f

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