Malicious PDF — malware analysis report

Static analysis result for SHA-256 7858248fd882a453…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 18:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b5bdb0109c259e30861a0e9ef7ff6b3f SHA-1: 4331e61a9722683585b6885c2058a82884a1576f SHA-256: 7858248fd882a453fedd383374f66039766f702c18c89e43fa3165512422aff0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://barbusci.it/maisUserFile/file/87209038000.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/7cff59d1c4010a9100058dfe2741ecfc/fadokizixojiwipodipifup.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/13274185088.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/205493106.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/wajidorefixuk.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/figofirilewatabefuwatenu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/gatoxetex.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090922203480554.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/jujotutuxabuval.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/porajeluzedivamesap.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pinakalarag.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zofonevulofozubuxa.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/25078275060.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/kobegutuminoliji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=openload+avengers+infinity+warPDF 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_off0000d0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 10964 bytes
SHA-256: a96786ec6c23491573b2d8a0b71a75aee50a2f3ccf7efec9edc692884b87ff75
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 19596 bytes
SHA-256: af98db692838d4e67a32b198109fde9721be3b822fb31e589c34892d7945a8e1
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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