Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7567cb86220ca8c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 02:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f772128e9d4d22555a586d5c140bf9c7 SHA-1: cdfd5351a64ea66a782f5ed09ca43c4a26f4fe2f SHA-256: b7567cb86220ca8c34ad69d6276006f1d81a6a3bd8f8ceff7f035703a23f7e77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to download further payloads or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/42662645525.pdf In PDF document text
    • https://ubranni.com/uploader/files/fibevukekumakajuzanamor.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/datelolipamu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/suxigiz.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/5870093469.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/75874631139.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/97903143774.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/somiwavidilafoj.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/fuxij.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/takibadurazonozerejije.pdfIn PDF document text
    • https://birudongker.com/contents/files/37357818355.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/51290375267.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b753bb64---19840764124.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vabulewolijinoper.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25ae0f297---75078726158.pdfIn PDF document text
    • http://selidbe-beograd.info/files/devipidagexetek.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/wixevitulojuselodawemurar.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/90908710012.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/45383008456.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/87280525102.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/woxulazabuzi.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/fofewak.pdfIn PDF document text
    • https://somogyplusz.hu/files/javogoperuj.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/dezewilubiviziz.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/wopaselonimalexedinef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gloo+wall+tool+appPDF link annotation
    • 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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 16596 bytes
SHA-256: 56a7dbaa279aa59190c77dada13b49813d031560ebe4f95625f3197bfd239a62
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 9772 bytes
SHA-256: e5abf2c038df6c853862dbd80f4a7c3289753b68a2db5d877c46a12b1c9b7810
font_02_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1