Malicious PDF — malware analysis report

Static analysis result for SHA-256 920a476269808cd7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 08:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e8f217236507f88041562bb2054e69bc SHA-1: adbdba7f1f8f82e9853c131cb6aab0f6a24474c4 SHA-256: 920a476269808cd77a754136cda2240169a7e5cd0867fd82b3eefe21138297d1
126 Risk Score

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 0.9974

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 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://crysiq.ru/uplcv?utm_term=vidmate+pro+apk+2021 PDF link annotation
    • http://www.insight-assessment.com/ckfinder/userfiles/files/2315697708.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/geripapopigogep.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/46080708927.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/fabuzifopizosexetif.pdfIn PDF document text
    • http://sparkpro.lv/content/file/paxisusilolimisinonose.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/jakojekijorukexozaber.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/74764652863.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/dapazazevituzu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///vajolizu.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/bazodovawowigapimugo.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/64767338397.pdfIn PDF document text
    • http://rld-carbon.com/file/sosabodiz.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/45126334179.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/52694074487.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/fumomidon.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/65270801898.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/93312674513.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/gobifovibupofu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/57585680813.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/332523810.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/73494453298.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/73714992135.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/45202870005.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/91285563271.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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 10592 bytes
SHA-256: 70e0a8300527fd5304b8636ecb1bc6f1dbe5b746b9edf22d3a88b8269aca2429
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 17684 bytes
SHA-256: 9542abfc8c4637d1ab3d0df81932f7ecce5dea370bb3e576f2c60c354acbbe10

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