Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7d505139676a18…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 22:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1c954801dcfdbc4dc1f14ca5103b0c5 SHA-1: 57610f389f129556afb2f81695832fc760c16c92 SHA-256: 1b7d505139676a187b767910f12803938b0e38f26c4a373b13c12b0d67626022
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://inwebjor.ru/uplcv?utm_term=best+way+to+spoof+pokemon+go+2020 PDF link annotation
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907181331622142.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kofawuwibitigiwif.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/74710469757.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/44028257502.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wanavovabir.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/59832622338.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/mubinutedajebogepol.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/bekepuxirusit.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/4024412630.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144418210a65---59265052638.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/74460643955.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8c0e08957e4159d5f6b90f99eb046636/koxatus.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/romipegoxepev.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/figujamilugadowigonawa.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/50450473672.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/15137052792.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/refovi.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/8235233230.pdfIn PDF document text
    • http://bptramptour.pl/files/file/falegar.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/55400541694.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/32209643384.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/94378903374.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/pisazomasabujim.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/livisotusuzefupimomo.pdfIn PDF document text
    • http://iscelenie.info/files/file/nuxexadelorusibog.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_off0000c33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 17968 bytes
SHA-256: 701b9cc07a6efaa42fdf57a2b0a9c2e6a242b93d70362671cbda82a6c18d6ec2
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 11052 bytes
SHA-256: 10680599e02652ff2d92dca4900dfadf3b93cceff3e12c147595568a4aabdeef