Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac15b759e779848…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 12:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ebd143883cde3629c1a7a1038c5108ec SHA-1: 2a73569257bf6688099ed5872c7f25aeb561b978 SHA-256: cac15b759e779848008d5801181818b891df8cc930c5aa4e3d9d3b3364c4b1af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://jacsonsfurniture.com/userfiles/file/43472790256.pdf In PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/jazolefutezan.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/34026971120.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/88806949085.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/pubibawaro.pdfIn PDF document text
    • http://darstin.com/userfiles/files/83098230917.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/81900436490.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/63928720194.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/47269080199.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/49845064191.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/18066389395.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/85155783413.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wemebetamebowivolexo.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/novukovunavaxokerabone.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wupuwewevenipozodaritevi.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/33366886309.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/vuduzizonoxevitisuw.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/98757081898.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/94595692821.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/lokemoladigavozerek.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/81471369467.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210929051201_2094146211.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/mebofuxexirajamarijij.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/5456589540.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493a16c91fb---watalibotalakememuwene.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rujufamo.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/52350548776.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/mipewur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=prince+philip%27s+motherPDF 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_off0000b870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 16356 bytes
SHA-256: 442a3a708ab13ffa61542dd93fde29f5a00129df28a2732eb34ec5a0a05064eb
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 10512 bytes
SHA-256: bc46b42879aefd3864eb0418a8665232e8ddf0f4877dea67c3a37747f2f4561a