Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f80c423602ee93…

MALICIOUS

PDF

68.6 KB Created: 2021-09-12 05:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b04c9454e6b8277195606f99e528a60b SHA-1: 1e566b499facad8733d0c889cc14f8c53a948598 SHA-256: 23f80c423602ee937fa8878bd98025c17554830ceb8c6e4a7e9872965edc4fc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable or used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or conduct phishing attacks by redirecting users through multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=auto+refresh+firefox+android PDF link annotation
    • http://carrozzeriabosini.net/userfiles/files/vefinujabadozurix.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/bafotefavozorosojekum.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/18022747852.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/671180262.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/53464127752.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccd471fd4---96160297032.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/14307295883.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/musevuzifenuruw.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/73231126900.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/6591444478.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/wirajimibife.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/dezixabuk.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630691683.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/19600422080.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/polozudajedamezibog.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/zesovuj.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/39602168795.pdfIn PDF document text
    • http://land89.com/ckupload/files/regigot.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec13ca28d---44185296694.pdfIn PDF document text
    • https://506hlapeta.com/files/file/wolegusugupexolireva.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/baluzikul.pdfIn PDF document text
    • http://kdekdyjak.cz/data/6712524178.pdfIn PDF document text
    • http://irinabailey.com/upload/files/nifapimufodusa.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewegosijurekirezajeli.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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 14804 bytes
SHA-256: 3926d363136dd2c065f39a82a1aded58d41f3018f63b294d7a210d3e38b5f8aa
font_01_sfnt_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 10588 bytes
SHA-256: c90e2d2b6b3a8bfc8dcb837db8ab8eb6ae899763da8c986b9e9ef6c44dea3848
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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