Malicious PDF — malware analysis report

Static analysis result for SHA-256 213224d5e557deaa…

MALICIOUS

PDF

91.8 KB Created: 2021-09-16 04:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2779dcf8903a817a445d2fcb9b4c09e7 SHA-1: 0f1300c6cdd85b33514a307d0f94ed75285635b6 SHA-256: 213224d5e557deaa4331f7ff590c4f76c4dbe6e3f3b6b0ce66f40ba7d1bd6971
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bluebiz.kr/userData/board/file/zosamodo.pdf In PDF document text
    • http://synfarm.com/upload/files/65065084501.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/89285502591.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/sakexupajiwuvavumigivi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/wusalulosekuxa.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/28887795913.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/51587721455.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/gutod.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/42333017274.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/41895657427.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/47136175164.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vinewoturimegidum.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/ditewobes.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wozufotelakos.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/47655899742.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/dixab.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/65253292007.pdfIn PDF document text
    • http://newo.ru/files/files/kebujabubexebopizevojaje.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/60121233630.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/lelisa.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210912103326690473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=add+time+stamp+to+photos+androidPDF 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_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 19380 bytes
SHA-256: 7f8010fa393bf5e5a244d6fcd97ba786d03924fbd2d4fc67b86eaf583c144793
font_01_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 10592 bytes
SHA-256: 8bf8c6f4d072b0f9e9073b26fb871154b745cd12310043d79ea7f41dbb9aa43d
font_02_sfnt_off000149c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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