Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ec952c3b5002bb…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 14:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9450836f629f3ee638b274adea6b4314 SHA-1: 355b3b02028602c8446ef5aa8ddcab92783c00d7 SHA-256: a2ec952c3b5002bbc420bc97fb20b5fca1c7e9724be7b9feecf11a711f9d41e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, and is flagged as a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of multiple external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zussobrance.sk/grafika/dokumenty/4684653713.pdf In PDF document text
    • http://gartenmessebau.de/uploads/files/82793012136.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5208caac9a21136cb8a9a1c2167ebee0/febuvaxitamam.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/31122721845.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/30809519057.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/jakoranutapalumi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/logenalexifuranutirivubes.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/rizeridedojawijizamemunu.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tusizanizaximonitopikut.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/29221384867.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/robimitademozasobi.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/91076944187.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/jovogidije.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/rolurefexalogize.pdfIn PDF document text
    • http://www.centralperdana.com/file/89581725000.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/74731744771.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/80928496982.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/sigamidizuvo.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/bomanejaxonuferelodili.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/divebiv.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c807175c---sovuwogosojitez.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/ridefe.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xegoma.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lovodowobesu.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/fazenuvutazubemufedodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cod+mobile+gamepad+apk+2020PDF 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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 18424 bytes
SHA-256: 6baa071b769fb0fca40c3603ab0a8a5aa836f25fe1bbeece63271bbe92e6ea2b
font_01_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 10772 bytes
SHA-256: 17a0e506dffa33fcedcd3cf728931411a1011f0f50f4796ae3f777c1a3dc2083

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