Malicious PDF — malware analysis report

Static analysis result for SHA-256 d898fade958a1fdf…

MALICIOUS

PDF

89.6 KB Created: 2021-09-19 11:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31e4f397d008c4137dc9e9713bc88f90 SHA-1: 82fec8123ac1033c32addc0152ec8e2389fadf6b SHA-256: d898fade958a1fdfc8ac09feb9ea85aa45fe401a7b9a7684dd953649dcc85363
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm directing users to external sites. The PDF contains numerous embedded URLs, many of which are associated with disposable hosting and redirectors, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=hire+android+app+development+company PDF link annotation
    • http://rgn2u.com/userfiles/files/botuwegofoxaroluvupigimob.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/wupakulapek.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/4157544227.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/fabikumafuvipev.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/95082783122.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/27830440585.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/18640956310.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/wugib.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/46224888551.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/ximegukefiz.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3e504bb4---gojogire.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vofisepojelolamedas.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/41125692232.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/kexebisufigibigumebo.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/54702807900.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/74891244736.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/volutuxakegiwatiture.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/82137118340.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/57230806200.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/72198717092.pdfIn PDF document text
    • https://huanghecables.com/d/files/76483930722.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/jurepupilajuviraropun.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16146300487581---67096859578.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/53224506412.pdfIn PDF document text
    • 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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10676 bytes
SHA-256: 11965c0d8b1fe043488010b1d05ca0dc9b35a7998e1ae84431293c97aab3aec7
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 18708 bytes
SHA-256: 22c65839084d0a98a79d9205d34f1fc3b46cd808170107851165f5f0b75b85a1
font_02_sfnt_off000140d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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