Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f267766120989bb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 23:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 499e8cbeed840600c4bdd8be47f2f5fc SHA-1: f31c2af72a551960a65e7417a8aa0ba857304287 SHA-256: 7f267766120989bb05b4c29d9d11f09feaac8aa06b5845d998c74581d485835b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many on disposable hosting, suggests a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, and the ML_NYX_PDF_MALICIOUS score is very high.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=best+photo+editing+app+with+colorful+filters+for+android PDF link annotation
    • https://brianspradlin.com/userfiles/file/xevaro.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/43988016876.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911024521.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/74077433829.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/92373046084.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/zogolufu.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/3339921225.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/nutimifusomuvatusibume.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/12069182109.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/91524367015.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/galosirajad.pdfIn PDF document text
    • http://lukinserv.hu/file/nelividudaravukaritij.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vadafeguwivanadosunugos.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/87210916612.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/duketagapeva.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/18469072940.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/rivavixamudinimisawola.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/kibavekagi.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/kavoxezozivomamejafabu.pdfIn PDF document text
    • http://reflita.lt/uploads/files/witep.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/sanidiwom.pdfIn PDF document text
    • http://fgosvo.ru/files/files/tegamorizesenutete.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://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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 16628 bytes
SHA-256: 09909087342f1f95ed1919ce14b81f7ede9ba93a27779953c2e3600ff5bc261f
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11140 bytes
SHA-256: de954202a4d7a6774994554bc163cc302b24325820702688626d5a5a0b194112
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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