Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8818a92bee3db3c…

MALICIOUS

PDF

88.7 KB Created: 2021-03-19 14:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a7cc9e57acdf9973241f3a0875b9b36 SHA-1: 208b3e7fb3ca34a10aa629df4833ff8ec9a3bbdd SHA-256: a8818a92bee3db3c433adfcc377639550b314c5abd383889d356f8dc718383fa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/wix?keyword=what+was+the+policy+of+brinkmanship PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369671/normal_602c88172a3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_6028c5026ee64.pdfIn PDF document text
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/6766663.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/bopimivapodow.pdfIn PDF document text
    • http://phrensy.co/zora_neale_hurston_their_eyes_were_watching_god_plotuhe8b.pdfIn PDF document text
    • http://baugroup.info/212848021533g8cc.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/4914987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mokupimi.epizy.com/munerofed.pdfIn PDF document text
    • http://jumezezufa.rf.gd/duror.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/project_team_kickoff_meeting_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/66544586521.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/akc_litter_registration_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/2010_chevrolet_malibu_ls_sedan.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/finesozoxu.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/how_to_adjust_liftmaster_p3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 5664 bytes
SHA-256: 0aa54f98564e0ea96f52590c9a0599b0effb9d4da7c6b58140e11e2a8f315584
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 10796 bytes
SHA-256: 5f0aca2cb16ca4e7fad767f9e9c61711603d7dafafa71e52cf79b11ddb1e9b73
font_02_sfnt_off000140f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F3 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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