Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cf9db261ba49ba…

MALICIOUS

PDF

92.2 KB Created: 2021-09-14 09:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75d03b13a6fc00caeb874fef543878ed SHA-1: d30eed8d7fa14f8366e9c36fadbb0db5251ed2f8 SHA-256: 01cf9db261ba49ba7c1842f50fd3633a9ee752be21d06bfecb0fa86f96048e3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=download+rally+rush+3 PDF link annotation
    • https://kingwaterpure.com/ckfinder/userfiles/files/46688324390.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/99951762839.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/zanuveledobonefudogobuju.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/64753726577.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/futinerex.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110150117700.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/21253196932.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/sefidijexiru.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/12985402061.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/64805568775.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/tifefo.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/72343480692.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109061449219027.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1764763841613d34e2a8c34.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/simawenulilogo.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/8878203722.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/19633930004.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/luxep.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e802e08eb---58722614393.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/55170866539.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/33429708305.pdfIn PDF document text
    • http://shahgrp.com/uploads/45958175507.pdfIn PDF document text
    • https://priscar.com/documents/files/80425999435.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/51937164178.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 10496 bytes
SHA-256: 8d09b8e9bf1ee48579bcca06ae8f37c6b8cedd99fc85f721662fb1101330a5f7
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 25028 bytes
SHA-256: 53b97c44701453be04c73800b0e839de43ade3f4c2b07f3b70f3a41ff6a508c3
font_03_sfnt_off000143f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00014c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C76 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d