Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfd54c1cba8322d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 19:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ba62290dea395de525788f8daea37a9 SHA-1: 1ac1fc82ffb215c2cc5f664839e9a484a7c5811f SHA-256: acfd54c1cba8322d0ba2a7b3d1e9d7e80b344487ea0c3a7d2794eb41b647dd01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this document is part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=android+calling+app+source+code PDF link annotation
    • https://krantiservice.com/ckfinder/userfiles/files/sewidevukutotamu.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/dekusapavevazexisirug.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/83401749090.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/jivetewet.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nafotodonaxorudigokoleb.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/vixugupugimokate.pdfIn PDF document text
    • https://drlanda.hu/user/file/89364236366.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pomenosofaguwevewara.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/laligitimojikoluke.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/tidoranalijisin.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/jimulejo.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/sobuxiwolet.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/58380368317.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/32341443429.pdfIn PDF document text
    • https://znalac.com/userfiles/file/nilelesir.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/98902152447.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/lobewutoj.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/56663007245.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/murimilafomopujinidume.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/91450089742.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/60120562999.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/41335192432.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b8b96480df90948d025a03a5eb0ea996/wapurinogatotodixuzite.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 17396 bytes
SHA-256: a2b1814bbe512f91d7f0fa8565014734d57e39e550fad9ba1c627d095680d7d6
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 10672 bytes
SHA-256: 855fa776b1e633611cdbe11530170289fe538585d0d9fa9ca60fd4846a2f25a6

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