Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b66f31477d8dbb…

MALICIOUS

PDF

82.5 KB Created: 2021-10-06 08:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94e09ba11c814ae52c6d8a862fdbcd71 SHA-1: b2982a2051445530ab52d7d83e7ca7cf7c0c259a SHA-256: 43b66f31477d8dbb69ff3b09b7ce01782b6d90f21fd6a1de83d5fd6f86e9755f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of external URLs, many of which are hosted on domains that appear to be link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=the+duff+pdf+download+english PDF link annotation
    • https://extremedriveline.com/ckfinder/userfiles/files/mosewezudonivazenesovosik.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/97551888898.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/najaruz.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/78011233081.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/lefos.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/rewosasenuxu.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/55193610791.pdfIn PDF document text
    • http://ministerium.pt/files/supiv.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155eec12ddb7---59925263009.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/21053875664.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/36045554605.pdfIn PDF document text
    • https://on-the-markmarketing.onthemarkmarketing.com/userfiles/file/7045714442.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210930_155612.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/napibipuxajenibugi.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludawebigosaluj.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kk82lr5v6sgn9behc9ojbiqk77/93779482727.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/gepafok.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/nonazadepeziliwagozuragu.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/33419066741.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/lezafutisus.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/77764860612.pdfIn PDF document text
    • http://101balkon.ru/upload/files/mekarib.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/tojejaxaromanopabiv.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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10728 bytes
SHA-256: 50ccc4c231983c49dad9cdd566465e157e0780dfc709762a27072506e853748a
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 19300 bytes
SHA-256: 5fa2273ce479a7fcbc76fc944cd7980afe2df6f21ed23f92c6af0c22286f4c8a