Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d53f9f64097380…

MALICIOUS

PDF

74.3 KB Created: 2021-09-22 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af25bddcd649709552404103875cc83c SHA-1: 027722ec6cf0c2fb26f96891b070c74b49969192 SHA-256: a4d53f9f6409738066415c063ff02cd0cbab40276b7811b50e629765ad6ea8a1
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=taxi+driver+free+stream PDF link annotation
    • https://asi-filter.pl/files/file/juvukenixurosodotininalu.pdfIn PDF document text
    • https://rajaunited.com/contents/files/89720043665.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/31963391988.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/dalivotagokiwopudesoxeka.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/97398070993.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/kumazeruvodedalezajuzet.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/40493818143.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/sigetazinozokinadesujivas.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/40148246434.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/82048278291.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/99301470790.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/88517921097.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62812200152.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/bepunawakibeb.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/39478527750.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/64740542832.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/guwaduxozas.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/69415503333.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/70593216897.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/navikowidubugadixawosulon.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913113831.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97998888174.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/55835883611.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_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 18124 bytes
SHA-256: 37651b580d4812e6ea31da1c94e96d7a1cb38df758e8f6a37ed1c3c497ffc0f0
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10376 bytes
SHA-256: 4acb7d8e6a4775d31b60523f3b14a11d0ee33d49b334258678987e933ce18a31

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