Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1243fa4d4a6209…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 15:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e131f3e1c00a217dc9f6063c87ec56dd SHA-1: 6eac70afe4b02c430dde2681bfe759262bc09d00 SHA-256: 1c1243fa4d4a6209c39c146816500a125a5829742b67667e7ac2325a07cccad8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical for phishing campaigns, and contains numerous external links to potentially malicious PDF files hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple disposable link farm patterns further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 67 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 http://wohingltd.com/userfiles/weletaredapalifomebusal.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/palub.pdfIn PDF document text
    • http://wmsone.com/eimages/file/basolan.pdfIn PDF document text
    • http://symbolfoods.com/files/file///88067909499.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/dikanetotenajibivuk.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/dekamudasixi.pdfIn PDF document text
    • http://exima.kr/userData/board/file/fakokofedelufifumepogimir.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/89055702678.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/89133550540.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/robewibo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wibisifekajuxilafasu.pdfIn PDF document text
    • http://telecycling.info/files/file/47551596682.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/mivamajajorasozo.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/fafaperozisemasami.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bab9d3792---21164357875.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9311e4c9c---fixolopawudoratuxamagevi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/dimar.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/10935775123.pdfIn PDF document text
    • http://4bx.pl/public/file/81656623585.pdfIn PDF document text
    • http://prompol.com/media/file/57269982896.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/63133679276.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89717977749.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/vesolazodod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=la+la+land+full+movie+eng+subPDF 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_off0000ad09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 14268 bytes
SHA-256: dce415a630c60c12a6a3db4cc23ee6407577798c2a30382673cd613695983e26
font_02_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10760 bytes
SHA-256: e5d8643415ec36b90266057af904fc0518e4cb95220ca9c7ed64a4b82b638966