Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b95a0a8c1c6ecd9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 15:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 51f6e06bc0d578972a2012385da00bf8 SHA-1: 9ad3487e360621dda1a4f0e1d780dbd8f07b691c SHA-256: 2b95a0a8c1c6ecd989ebaad2954830eb66934df5e5da0417eac3a30f94cbf473
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://lighthouse-connection.at/myPix/file/71824521349.pdf In PDF document text
    • http://happysmilecard.com/uploads/files/pafeladolubibut.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jegibupenidabikutodabo.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/rijoletidit.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/63253373859.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/murivotokogov.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/lawelaroduwugup.pdfIn PDF document text
    • https://tekartltd.com/upload/files/55948299228.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/78420657844.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/sujuw.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/59166793235.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/68347208501.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zadodevu.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/bezajawibexufub.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/gekitifi.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/gofekixodit.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/35377626779.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/21169567886.pdfIn PDF document text
    • http://4bx.pl/public/file/sogidez.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/88409128752.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/52e964ddfa6988d8ea0d4c77971ab4a2/gimedavukepumixisep.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/pezisakubogorasu.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/050232351599.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109020719364284.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/26067121350.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109120522105294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stick+battle+war+of+legionsPDF 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_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 17192 bytes
SHA-256: 496c4fa67b3bd5c13acb194dad951d962cbc8e68fad43154d7c33c3e3ecfbf01
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10904 bytes
SHA-256: 03edac3383487ff51b59de574cc0384d10a36220ace9dff0b57484f48665b64c