Malicious PDF — malware analysis report

Static analysis result for SHA-256 825c88dfe9df9687…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 16:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a691da728e40ca6f02a0189b92500451 SHA-1: b18a65eb10e77a1995c35a14759899e981f233ea SHA-256: 825c88dfe9df9687aa69eb6b435114225a4723c704dacd399068b9c2c7de92d0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs, one of which points to a suspicious PDF file on 'mawratanews.com'. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mawratanews.com/armedia/uploads/files/saledeno.pdf In PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/59207463523.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/95700548894.pdfIn PDF document text
    • http://alkanboya.com/files/file///minaluxitemi.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/92987443518.pdfIn PDF document text
    • http://kaies.cn/upfiles/210913152644195409m05zy5.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/wobaxevifedulazusitixov.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bigaxa.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/wepezole.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131fec70529c---lujibuzukijobipapeferutaw.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/39218951180.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/70382215437.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kalekiromakogokir.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/sasedusirewadovalilas.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/5324389760.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/69590027266.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/56961913486.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/sadewikunugefuworuj.pdfIn PDF document text
    • http://pi-consulting.ch/download/51596523805.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/xesapozesu.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/80017662140.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134293d70ddf---zunoja.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/mubesugemupavoluwofekek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=acr+android+11PDF 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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 9952 bytes
SHA-256: aeaa9448a784fd71fad30021dde24a2aaa06bcdf21b63906bedcd477c8fd002a
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 17436 bytes
SHA-256: 6f5a3cc0809cb459462c84f58c2fe0e981796f4d4cd8b9af788fd76a33d16ba7

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