Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91356d28ee74cd8…

MALICIOUS

PDF

82.8 KB Created: 2021-10-06 10:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ccc57899f72993ee450705aa809f158 SHA-1: 33e12b3d19b660b068a252f92ad5f09dfdac002d SHA-256: b91356d28ee74cd84c34842768a13ff3464e39f29d06da82620794b4849f9a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=county+of+whittier+ca PDF link annotation
    • http://diadiemvui.com/upload/files/robujuzubirifenebozekaveb.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/birawetoli.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/kigolopozumujigufa.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/xuzezixelenivegifo.pdfIn PDF document text
    • https://rippa.pt/files/file/filelapupako.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/98859371039.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/5775007540.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/13552778444.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/56180162356.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210914_FD34534E3A75E634.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143930f45b66---delamorurofunudutuk.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/89708471850.pdfIn PDF document text
    • http://mastervin.ru/files/file/lenikivavenoxol.pdfIn PDF document text
    • http://signauction.net/userfiles/file/visizem.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kesinivakisuxugemab.pdfIn PDF document text
    • http://erex.hu/upload/file/69827184347.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16156c11d8dd60---70745317684.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ruvul.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/23158579086.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bukiwumemisati.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/gevev.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/fumibef.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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 19492 bytes
SHA-256: e987879b2a1af27299a187aaee0b54889b63bcd093bb767dc6481466828c41d1
font_01_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 10552 bytes
SHA-256: b9baa49368bddc6ae511528e1afa35a51f1b7a6489cc2f64e8a4b8d4a6e88a6b

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