Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a04d0f6cd0eb0b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 16:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e080772e54e3eb5f3a0cb9a9d3c0bbfb SHA-1: 365bf6376ec57e58a6bdd64570c328687fab45cc SHA-256: a2a04d0f6cd0eb0b3e564de996e7f70537f862196b0e88cbe7711a7e06521d69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. 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 links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://sssmri.com/ckfinder/userfiles/files/43528433642.pdf In PDF document text
    • https://indobaliart.com/sitefiles/file/xaxolaboziju.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/kezapexibexekefeseveju.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0p6tqhslf1gnc33mgf63cpfh4/raridabo.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/titubefufiseg.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/39lr7nobpr0e36tcn6s0lfprr4/31335773699.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/nulusazukadukajufasenowot.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210926033034_33sslo.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/80066318225.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/36631784558.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/70395438502.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/vomafibusat.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/zanigufitikaf.pdfIn PDF document text
    • https://ivanamihic.com/files/posoxu.pdfIn PDF document text
    • http://teplicky-fotograf.robert-zauer.cz/userfiles/file/25448310135.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/ludezisulaviwevufidalesof.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/33793250805.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/71810092444.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/46361975266.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/52074898485.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78155270777.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/puxujesoma.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109012118151342.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/53240688010.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/38788741075.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/97769318845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pvz2+unlock+all+plantsPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 14472 bytes
SHA-256: f56527651eb5e5f06872f6cd9bc093755171ed15f8b6e13d13ce930aa63e5223
font_01_sfnt_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 10484 bytes
SHA-256: 3645a8c6692cf716aeff14a7c86be6817f3a10a2128749e629a854d8601f70dd
font_02_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1