Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aabc12020eaa667…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 01:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cadbe8119e174a78c19297b95002f31a SHA-1: f0ad4d0079a6984e7ea0acc045f10124ddca6319 SHA-256: 3aabc12020eaa6673656ca2426f3db411d6800e7fa85e9d0ca46d5bb5e0c512a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38150792236.pdf In PDF document text
    • http://master-br.ru/img/file/pevoso.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109031032409776.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/81104831702.pdfIn PDF document text
    • https://anfauglir.com/images/file/97276253094.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/wizupetuvudum.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/6200274302.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/87626386550.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/vedejeloritege.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pomujesagemagedoralidivuv.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/19447932006.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/42317572042.pdfIn PDF document text
    • http://heureka-cz.eu/files/67618448959.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/47170753495.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910545534688.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/70120849339.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/bisomalewemetivodeno.pdfIn PDF document text
    • https://akconta.com/uploads/files/3866403763.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/fogebijetipaletuf.pdfIn PDF document text
    • http://519pf.com/userfiles/files/46919620619.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/74730827630.pdfIn PDF document text
    • https://rubfila.in/files/file/40504617000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+music+tag+editorPDF 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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10748 bytes
SHA-256: 4399d8360b3ba5b0be4767290ba0aa652d863294677ef523a72ffb5691a467bb
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 17024 bytes
SHA-256: 0a3e867dc6f1dd5049b6f12cb0e83aafd18994cc05414265e2a5d780b163ff25

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