Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22eba1099bbeac6…

MALICIOUS

PDF

80.0 KB Created: 2021-10-07 17:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9469bf854e2f503dc024c0dcaa2194c5 SHA-1: f1a1cfe41ba9bf97e839564a9832ae2f60265dfa SHA-256: c22eba1099bbeac609738d2932763c2c53103447f24f3fe18c99096a5dca4c91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing operations. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cybernet.asia/UserFiles/File/karulavawimegokesodavot.pdf In PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/miwumiv.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/paxagolalik.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/23292074592.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/72069375065.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/72947353805.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/dalojiwovosekimazapijikap.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/nekixabudup.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/83465886985.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/dugexuxasutagibozagurugoz.pdfIn PDF document text
    • https://birudongker.com/contents/files/23935001048.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/neduzutokuguxugopiri.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158f77300043---69581272148.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210920_94DF5447D987E567.pdfIn PDF document text
    • http://protok.pro/upload/files/30398134942.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/40631379725.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/tojopisutatugarevibosuj.pdfIn PDF document text
    • http://recviem.ru/img/upload/rarilakinopuzajaxazo.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/27947552051.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/44755236685.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/73846901250.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/93063165847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+plant+romaine+lettuce+in+a+potPDF 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_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 10544 bytes
SHA-256: 26c6c6866a2b844319fac7c4e4c543d4a799a12beae0dcb7e74d9bfb433fc043
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 19844 bytes
SHA-256: 8d9a80a91871e3d5244a0f96c81ec9bef4fc904fe07effd533f7c1f3446a742b

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