Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf7466be29774e4…

MALICIOUS

PDF

75.3 KB Created: 2021-10-10 00:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fae2d78c6334dae270e0c9788fd8ec29 SHA-1: 39e7201b8f34f2efa996f155691a0b3486b4007d SHA-256: 6cf7466be29774e41afe98f23b3ec6770026ea215f63ed18c24ddbd7e7fd3921
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm or phishing lure designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://gfk-schwimmbad.de/i/File/wizez.pdf In PDF document text
    • http://auswallendorf.de/userfiles/file/jitoguderafujak.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/batexukexojavi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/23271678119.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/xanogegurirabufovuziru.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/57202213786.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/zitiruxajogev.pdfIn PDF document text
    • http://sung1.com/upload/files/pebavetabo.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/daluw.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/torulemorexuvuvejefibodam.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/bugokoz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614eda4701f15---tumevoto.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/1900451588.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/97625462257.pdfIn PDF document text
    • https://kimcert.com/E/file/titezuledovuletitilezu.pdfIn PDF document text
    • http://ahchala.com/img/file/temovowimilep.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/76388461167.pdfIn PDF document text
    • https://unitjaya.com/contents/files/dixapafujiposefoda.pdfIn PDF document text
    • http://bamila.vn/luutru/files/xazalaxopifajefej.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/furikedugejilakuxifimew.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/13340367213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=current+affairs+2021+pdf+free+downloadPDF 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_off0000bdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 18616 bytes
SHA-256: 73a918bd5096e86be88bae58c3f635ed24e56fd570713e5d154d21a2d0433e9f
font_02_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 11004 bytes
SHA-256: e5b0138446a2f463aaf937e41299d391cad37bea7f902a044badd440505045e5

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