Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a4a3231f008479…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 11:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0218dde24604f68563aaa08c3c6bcad0 SHA-1: 0cdce8fe149c46c660d35a4bd0cc743fd17ab3fc SHA-256: 63a4a3231f008479067b146cdeca9bc1c7e200ca82b86b6b1316d591092569f7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic PDF_IMAGE_LURE indicates it's an image-only document designed to trick users into clicking an embedded link. The document body is heavily obfuscated, but the presence of numerous unknown URLs suggests a link farm or redirection mechanism to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://imihwa.com/uploads/image/20210912/files/20210912040218.pdf In PDF document text
    • https://ladachess.ru/userfiles/file/parodelukug.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/88325648741.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/tifalifonifagenefa.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/wowizumutuludibuzajadote.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/foneposopokirifala.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kawerujibel.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/mubatexurer.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/kujepakitozemoman.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/kumutuwegojexipofozax.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/69563269375.pdfIn PDF document text
    • http://llux.vn/uploads/files/tuvazojabo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/73068241992.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/95792051530.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/jugulodo.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/90361433988.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/24574818609.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/71930785245.pdfIn PDF document text
    • http://haki.vn/uploads/files/1711732752.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/fosopikuresemetoliguru.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210903212720.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/40388595533.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/zukawosol.pdfIn PDF document text
    • https://tsegypt.com/file/penekok.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/panazosajakexirobanejo.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/71210908013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=candy+crush+jelly+saga+modPDF 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_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 14632 bytes
SHA-256: ba7a4d74f0426644702901cf3cf31a5db84b5451feaad3842bcbc3c01e83766a
font_02_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 11004 bytes
SHA-256: dab0d0cf0a319aa95ff6a45becb8c304e2910bed07e6639486be9906b0de4be3