Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b9733d4b502e5e…

MALICIOUS

PDF

83.7 KB Created: 2021-03-13 18:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be9771d711fac7c7ea2b089d62c5bca1 SHA-1: ab8a40cb31579b1cce0b05b707a1461c8126fd71 SHA-256: 17b9733d4b502e5eeb1013bb3d3aeda36b44fd5f68e92a36fa69f7b597c5f83d
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://xajibur.ru/123?utm_term=informatii+despre+festivalul+roman+apulum+wikipedia PDF link annotation
    • http://zedukibawubige.22web.org/fuduligasejalowefari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ff29e490da49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_602d55e4b38a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6031fd3458cad.pdfIn PDF document text
    • http://werisafijorarit.iblogger.org/77036799655.pdfIn PDF document text
    • http://guketaz.iblogger.org/16888271674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_604aeb15b4ed4.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/hhBjeaB/figuginujesanufadaji.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/LjghhSM/zitanamusisoborujipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5ff5199c8fa0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_6035c4a05d95d.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/pusixa/bixoteta.pdfIn PDF document text
    • http://dalobimonutodez.rf.gd/7670598088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa9c191-0ece-40db-a837-e0aac36974fc/diwan.pdfIn PDF document text
    • http://vimonaker.epizy.com/vukiwax.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/olympus_om_10_camera_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a272d23a-f5cc-4e34-a39c-5f3ee56872bc/whittling_chip_card_requirements.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_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 5340 bytes
SHA-256: dbdb35f8eb2e87f7073928aff66716e3375f508386e5dde535bc28e78e2d08ff
font_01_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 12592 bytes
SHA-256: dc7267fef3f12ef54411efa712aedf062bac2bad07b66ce1a15d1c0eb52e6623

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