Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b59ebe966b1220…

MALICIOUS

PDF

67.1 KB Created: 2021-09-27 06:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8453dc9ca42b8e21615d35f697876ccc SHA-1: 6ffc8389f640cca39e964dff0cb0de4171956459 SHA-256: e5b59ebe966b1220fa07d30b140960d00a041878e13d8679816237295d01e0e9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_IMAGE_LURE heuristic indicates the document is an image-only phishing lure, designed to trick users into clicking an embedded link. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous extracted URLs, many pointing to disposable domains, reinforce the phishing and link-farm nature of this document, likely serving as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=edna+bricht+aus+android PDF link annotation
    • https://palcev.ru/userfiles/file/bibivis.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/diwelazagedifefudemukub.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/temilenonejega.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/67203981430.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f220d2b33---21381919659.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/33946737398.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/98642314958.pdfIn PDF document text
    • https://ahha.az/userfiles/file/87770943140.pdfIn PDF document text
    • http://yongqingtech.com/d/files/70225480281.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/zezefaku.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/bimugitaxo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/29843662780.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/80462055475.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/1476396069.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/85808430041.pdfIn PDF document text
    • https://nls.vn/upload/files/90915951823.pdfIn PDF document text
    • http://olympusflights.com/files/files/20221244490.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/zesatemusakogux.pdfIn PDF document text
    • http://exosushi.com/uploads/files/31373603164.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/83847839183.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/rezumoxijugosanotol.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xejixodepiguwiruru.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_off0000abbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 10512 bytes
SHA-256: 0a9c92f76291a3714156765ff7c690d08bded757edfc89a46f61ce12bd2f805e
font_02_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 14440 bytes
SHA-256: 5afb119f28730d1be35bfcf71f9132cf0cb62440dc354c88f5059589555bbecb

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