Malicious PDF — malware analysis report

Static analysis result for SHA-256 90310cb3ce2d02c4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 23:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dafb26ef75abcf24afcd368597107147 SHA-1: 1c1420ae3655dfda15f66c6742044085a6e67588 SHA-256: 90310cb3ce2d02c4cb5624c1403481aff487158fa5576c9b4167c4eec891b461
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://architettodrabeni.it/userfiles/files/95953913773.pdf In PDF document text
    • http://konberdbio.com/upload/files/23144175953.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/miredesufeposewimenap.pdfIn PDF document text
    • http://superazs.ru/images/news/file/42386900245.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/2960935466.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/fujonidenexidubijepukajim.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/disizijometile.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/notawafimepupaxulawi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tetolikagexa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136c47aa111e---vomasakur.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jemuxowemoj.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/rusol.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/fetiwetanifiv.pdfIn PDF document text
    • http://hmed.vn/upload/files/xujaronajebedip.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/volulexixuwiwimigil.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/25040720620.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/39110393206.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/ludazisalakavonisijugu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/up05kvcl549ks9inj8difir16j/44632693762.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/saxetanuwixubuguxatute.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zupuxujefujusipizijiz.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tepebejilibu.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/lanun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+fire+clone+app+downloadPDF 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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 10408 bytes
SHA-256: 82487591892f3cfbad80c2797ea0f81201370210f4b2cc31c2c61482039bb792
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 17916 bytes
SHA-256: 47dffc0e4968dccc65e0147c9e2439d12be12d8cd0139852cce4cb69e0fb6c12
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1