Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d5b0bcf869488c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-10 05:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 74652a685ef2eb5cb882f1077b22c408 SHA-1: 0a3a57e81180b0b4b200193be229412d15dc3d48 SHA-256: a1d5b0bcf869488c92c72b4cbac52bf5da077d98ad00451a13d32cf38e248e2c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/award?keyword=o+reilly+oracle+books+pdf+download+free PDF link annotation
    • https://duwawituku.weebly.com/uploads/1/3/4/3/134306950/lovepitimajo-bavujuforubiluk-sexusutalu-ganurijoxukoxur.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/8747464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5fd6f91950c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_602b077e6792c.pdfIn PDF document text
    • http://ezfix.asia/440947409020ytpq.pdfIn PDF document text
    • https://wadenipix.weebly.com/uploads/1/3/1/4/131408068/womefedavapi.pdfIn PDF document text
    • http://sungo1.space/the_blackness_of_blackness_summarywl279.pdfIn PDF document text
    • http://goldenframecollision.com/69393126007orz4a.pdfIn PDF document text
    • http://scm03.ru/xetavedaywiee.pdfIn PDF document text
    • https://nodudovipum.weebly.com/uploads/1/3/4/7/134711526/fisifunosag_rarilemebu_wokolo_jisutuzar.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://zotomogizolelaz.rf.gd/yowhatsapp_atualizado_setembro_2019.pdfIn PDF document text
    • http://fojupejededoto.epizy.com/lipiparusem.pdfIn PDF document text
    • http://zofewodugap.rf.gd/numefadi.pdfIn PDF document text
    • http://jebejabekuja.epizy.com/how_to_replace_a_septic_drain_field.pdfIn PDF document text
    • http://natikopudidupex.epizy.com/google_sheets_offline_extension.pdfIn PDF document text
    • http://zipokuxabatu.rf.gd/powubujukewejoje.pdfIn PDF document text
    • http://lipesomidu.epizy.com/xofoporivijego.pdfIn PDF document text
    • http://jexiwowope.rf.gd/47681641388.pdfIn PDF document text
    • http://vosoximulitit.rf.gd/14121119799.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5280 bytes
SHA-256: d5dfd38582992ff2e14bb3415fd393ea98ab0bbefc0ca71f8509d59bb4d5fa95
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10544 bytes
SHA-256: 425eac4e9093ce3fd44c45f9929b0b6f95eec5d798b539409d8e3eed6b44e256
font_02_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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