Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd9d06a174385d1…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 22:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 535f0ff18968f73b75703665624a17d7 SHA-1: ccbb036ec99256a3c5a8cb16c4826fe34afd704f SHA-256: ffd9d06a174385d16810b49620044502a81d017425b9c1f37dacb23d95eda957
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a potential lure, and the presence of embedded URLs indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://atpl.aero/ckfinder/userfiles/files/dexupowefafejifovara.pdf In PDF document text
    • https://fobh.net/userfiles/files/gonajat.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/dobopunovusikomo.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/40582398671.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/xegabikotuju.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/94118249103.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/tawixorupetuvetaxobu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/10196693660.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a76ik9ung6kcidcdhgn5555peq/monipogope.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29278217706.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210902191952217.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tozaxixadekuti.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/werijanovugu.pdfIn PDF document text
    • http://www.mmgrowersg.com/ckfinder/userfiles/files/53372046761.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/mutupekimititikalazivo.pdfIn PDF document text
    • http://dalaichau.com/files/43775508414.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/34357980963.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/vewaludugepomalasiwinage.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/31860041845.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/65215873579.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/51498455025.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614933629ef2b---rozoxekidorenarozoloje.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/jibazogobixupazenunixex.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/mibeduregilumakagukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=demon+slayer+watch+movie+freePDF 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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 18548 bytes
SHA-256: c344dbf70621af7c7ec4490354e0bb3e44e7c50026a84a95004783b2b4b1edcf
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 10868 bytes
SHA-256: a7d78d318b5717ba4bf732c28a1a433d39c3cb815f4740367a1c16df2d92dc63