Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcecf470744efd4…

MALICIOUS

PDF

70.1 KB Created: 2021-03-10 10:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e4f53356db63deadd9cb828741f983c7 SHA-1: a41da9802ba269a981ac6b77613074c15deb6693 SHA-256: bbcecf470744efd45c6a6458bb0b180afdc5576c8a73b4ccf746f2be640ca491
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'vilenefex.ru' and 'sezewadiwadiwun.22web.org', which are flagged as potentially malicious link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to harmful 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://vilenefex.ru/award?keyword=welding+machine+circuit+diagram+pdf PDF link annotation
    • http://sezewadiwun.22web.org/5602633609.pdfIn PDF document text
    • http://samubed.iblogger.org/l_ergonomie_au_bureau.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/kulilanafutirumepugize.pdfIn PDF document text
    • http://save50it.pro/good_faith_marriage_affidavit_letter_samplep9ec1.pdfIn PDF document text
    • http://natural-shop.info/impossible_quiz_26_answereud4n.pdfIn PDF document text
    • http://100naturals.fun/fidessa_user_guide7vwum.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/fejuzeluwoso.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/41275446921.pdfIn PDF document text
    • http://tameenegypt.com/puminajujidegazimajufuxqhlys.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/2023635.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/boxekukelamakob-vegaguwosi-gesefe-neledonupezasej.pdfIn PDF document text
    • https://xomixosusanit.weebly.com/uploads/1/3/1/4/131438267/vetuwobe_favimupazojofu_mivawupas_tuxibakofagaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_ce2673de954d4b04a69cd8717a7758df.pdf?index=trueIn PDF document text
    • http://sabukizazuse.epizy.com/segezapopuwudizafadomaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/79879373583.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_3c414e8560594803ba4d3f240231d3c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/assassin_s_creed_odyssey_dlc_pc.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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 5404 bytes
SHA-256: 663f398f750e2c8b226dfcde7a454ebcb5a719f1399b0f5c287a876b1db4e26f
font_01_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10148 bytes
SHA-256: a1de797fa1330e91ead31dc13c61f140d29ef90d1c010eeb49e21d2eb6211581

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