Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24217183e84a9aa…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 01:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4af1c7670e5b1a79b04b8280ee75abed SHA-1: d0d14c56eb0b648ad325c6351cee3b5708fabc93 SHA-256: a24217183e84a9aa85ecb8208df8a35aad66bc94b2825e54c433d10833be00cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links to external PDF files, many of which are hosted on suspicious domains, suggesting a link farm or distribution point for malicious content. The presence of a 'download button' heuristic further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ekonopuntos.com/campannas/file/zajivinaba.pdf In PDF document text
    • http://around-sicily.net/userfiles/file/nidexagupabolagaxaro.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/fisegozorivarudikorojad.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bavalilulu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/suriruvipamojozixo.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/f646ac5c6be6e4ecca9c5d0c13431f60.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/resafanax.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210901_092615.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/96062200697.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/kumuvivimavamigiz.pdfIn PDF document text
    • https://terracell.info/images/file/navabalutijenixutezadiwij.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/50718185860.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/32421688658.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c322922f7---nejugowuserujeja.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/68282261115.pdfIn PDF document text
    • http://ccshecea.org/upload/files/rolezuwutoxotivir.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/kamekegilogigovositujobo.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/kusavosiwibomu.pdfIn PDF document text
    • http://wwstationery.com/files/file/3707968675.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58463772506.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5493bd03---misitikexokenubujidetuwi.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/77736831341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cool+jazz+font+for+android+10PDF 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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 10444 bytes
SHA-256: ea43124a42283499dd8672796ea6950a1afadf1e4381c548eba10e196d4e348d
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 17404 bytes
SHA-256: 53bf626feb0c93fdfd25a474cde24962752e535469e3760c39764608f49b5d8e
font_02_sfnt_off00013697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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