Malicious PDF — malware analysis report

Static analysis result for SHA-256 3164ecb2aa04ed00…

MALICIOUS

PDF

80.1 KB Created: 2021-03-09 00:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e83abb71368a8cfbeab2ec8f3be2dcfd SHA-1: 2065d807ffb26fa2a6c9e0f103bbff0e7f389e4a SHA-256: 3164ecb2aa04ed002224591a542db1c7c141baab553d6f9b92cefc897589018d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The embedded URL and the link farm heuristic indicate a strong intent to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=royal+armouries+application+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427094/normal_603e23e59fa37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fe553dd1d9bc.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/sofivuzefi.pdfIn PDF document text
    • https://wolazana.weebly.com/uploads/1/3/0/7/130775510/fasabupifak-zodumudate-musuwopot-kebuxewi.pdfIn PDF document text
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/8671704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486190/normal_602f3d3d95cff.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/what_does_blinking_red_light_mean_on_lg_tv.pdfIn PDF document text
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/4654616.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/5037348.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/15590545397.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/22980177297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_603e572b53cee.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/lajipiniw.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/dakodelifujajolokugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469841/normal_5ff5a65a2bc27.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/98527859334.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/rijowonapumanolix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizenatoxu.myartsonline.com/zilurowulegabobubilem.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/xosaxawid.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/what_is_the_goal_of_technical_writing_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c4cca3-63d1-4d02-83f1-b4af294c7754/tipos_de_bombas_de_vaco_para_refrigeracin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6192ce5-44f9-4777-bfa0-59e5e842dd96/69657394869.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/75628535038.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/metformin_xr_vs_sr.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_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 5268 bytes
SHA-256: bafb46db60b20298363b2a74ab14bc0a87e3655bde509401ffd387b104f1375c
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 11228 bytes
SHA-256: 3f79e08c5700f03f11a6f1da2137006f83c571124d51ab79c5701ed1654adf4f

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