Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acb487d64e19b54…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 03:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ed3a098713cb0279f11f53c313f7458 SHA-1: 249695d70cecaafd20c5bdc7bf2053a8ad087e40 SHA-256: 8acb487d64e19b54d6dc56a8e8a4d5bef1f426d04f464bda8c78d3f8df6d0f95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a common tactic of using malicious documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://guides2alpes.org/uploads/file/68250796626.pdf In PDF document text
    • https://ventsistem-bg.com/userfiles/file/zuxenofox.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/lumegozejugotokifara.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/27135443237.pdfIn PDF document text
    • http://apvn.info/userfiles/file/14962473112.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/65197646893.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/jomufimufezogesagafuredef.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/lodunogewif.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/47984906176.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/96928107897.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/pajusonutufojobe.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/kivamibazewi.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/fufusabirij.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/bikazeb.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/44782512811.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/suwudafowosotes.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa798c300---nivukul.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/zoxinepulazujovumi.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/92934226041.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/48347755483.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83214699084.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/34771125309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=root+app+for+android+6.0PDF 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_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 17392 bytes
SHA-256: 64f240df652488f49b904de4f9e060e19ae39280b0901e9325f04d2ffa246256
font_01_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB8 10544 bytes
SHA-256: 52d49f810d8af4215aeaaa9e33a630b230fa810f4f2b33e8df5375bdea789368

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