Malicious PDF — malware analysis report

Static analysis result for SHA-256 e986f84fe1ae31da…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 18:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dbf3bea0fca78ae2887746026af0601 SHA-1: 4f7176bd0835f11bb7a257c28ab70167906d9830 SHA-256: e986f84fe1ae31da990fadee23b8bb44b161225f2f0f2d2a4a3709c8c5d14e94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links for SEO manipulation or to obscure malicious destinations. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=how+to+see+notification+log PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416bde5857b---79574272347.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/32058680478.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62389796850.pdfIn PDF document text
    • http://computerdoki.hu/user/file/lapumikiwewowevibadavu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5fbaea91---zijifu.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/50696823547.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/rapewatix.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/soxowefobapasosa.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nesixufude.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/94131145990.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/bitiwuke.pdfIn PDF document text
    • http://chromavials.com/d/files/vulugomikamasiripiwubij.pdfIn PDF document text
    • http://nscenter.cn/upload/files/48703422151.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/vopugowogegepagubas.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/24755375421.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/piluxubalajapotaxoxilas.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/xukamesimirejugogibogex.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/69362956114.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/7153941747.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/38048249447.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wejazumubejevetodezek.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/45596191736.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/debokizagawixek.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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 10488 bytes
SHA-256: f716de53dd0062bbce8429977a40feabfa102bfc1a69206d25216d32a66474a8
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 17744 bytes
SHA-256: 4473e0c6d8d800ae89acecf0c6d4e15f771730230b6dd5882050c378fc32e6eb
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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