Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb6e87484c6b2e5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 00:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d642f8a6fd2868077f21ca6c137a35c SHA-1: 70ab1a78a2fbd199c8550faa962ecf0a60705eae SHA-256: bdb6e87484c6b2e57c04fee441e821bb8ff758bbade3dbb8a07669f2b074a885
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://sarljarry.fr/userfiles/file/movanexesonigibewixude.pdf In PDF document text
    • http://fullerton.kopanramen.com/uploads/files/57837776346.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/27220499085.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/86897883942.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/20822561058.pdfIn PDF document text
    • https://mbbs.hr/files/37029889957.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/af57719534a4a2a7102ffefadabb5c97/13002476657.pdfIn PDF document text
    • http://techbis.pl/files/file/dozivitawexixevevemo.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/45157850096.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/92655938033.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vutatijubexevage.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/35866026682.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67890275437.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/16056433145.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/zavotuwit.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410813407ce---ruxabogurepujugatuxidup.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/60669049430.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/juseronadakema.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/65525248308.pdfIn PDF document text
    • http://dkind.net/userData/board/file/pukizomejebubuwase.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/nizogimapoxawutuzigofifov.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/95179213217.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/43393678986.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909032215.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/nalewo.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/kigazisat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=delete+preloaded+apps+androidPDF 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_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 10388 bytes
SHA-256: 10c81189b71ce410c508405c859477dafb91176d4307320789184bc906cbea71
font_02_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 15036 bytes
SHA-256: 296dc1de179b1f0ad71a1984fbb557401a65cbb7e091661ee779de1b12363785