Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4056425db38636a…

MALICIOUS

PDF

67.0 KB Created: 2021-09-30 21:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 249aea030d4adcaf3bf94bc7f16aeae3 SHA-1: cd4428e16723a09239481d4af1d38aa35a6c0a3f SHA-256: d4056425db38636a67a6c7e38ed8da616d9d664683538a316d06a1b583328e0e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable actions, typical of a screenshot lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites for phishing or malware distribution.

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 https://vrrc.heart.net.tw/ckfinder/ckfiles/files/84021744103.pdf In PDF document text
    • http://radis-rrl.ru/userfiles/image/xajomubumezo.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/59370096344.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/wimanuwazeka.pdfIn PDF document text
    • https://areicon.com/images/file/37146509235.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/48230422917.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614f00d88ebf0---sekezowawizanovepu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/69314604043.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/xixunobupajipobom.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/64800669652.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/86302477383.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143144e4717c---vugef.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/zizokemovixabunotik.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/mukupadubuto.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/9383867252.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xowugagakojalukejoxaga.pdfIn PDF document text
    • http://labsshop.com/d/files/gufotepakoto.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/55616511684.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/62990169000.pdfIn PDF document text
    • http://stw-nowogard.pl/download/file/58317230544.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090202200798.pdfIn PDF document text
    • https://aokman-drive.com/d/files/86174085399.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/jisowafavurobev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=good+fat+foodsPDF 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_off0000adc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC2 14124 bytes
SHA-256: 89986462290ecd0c787d86ceb1351c048eed8fe18ab54de5f5f3188d949588fb
font_01_sfnt_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 9912 bytes
SHA-256: ba777826c9c7aa28e740a1d50fd97afd7a07ff2ff55a258c8ad24b0b73786700