Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8d6a3220c7063…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 08:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dd9ff4d88b3c53a6e45a1b9aee999a4 SHA-1: 8a21638ace7e4447efa47655355362d51a60de70 SHA-256: 81b8d6a3220c706378690fc383fcbfe3ffb93878982b63d414eae5767a7d647d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV and an ML classifier as malicious, with a high risk score. It contains numerous embedded URLs pointing to potentially malicious sites, indicating a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's part of a spearphishing campaign, likely attempting to lure users to download further malicious content or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pixomot.ru/uplcv?utm_term=how+to+turn+off+light+notification+on+android PDF link annotation
    • https://otomatcilarmetal.com/otomat/upload/files/84115842025.pdfIn PDF document text
    • http://m2m2design.com/userfiles/71223157321.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/riwikefaxinuwozarabuv.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/gureka.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/95430175042.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/beverapakerimumujexexe.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/30498881673.pdfIn PDF document text
    • http://profstil.az/userfiles/file/25299565221.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/25022345380.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/tefefuguvaxorato.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/58308345252.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/24546033144.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/narufisatirivovedaz.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/magunoxe.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lukerugujefuzepul.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc39a925e8---30980868261.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/vudakedupuzewupajir.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/gowokikebururipibuno.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/37371575952.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pefunerutanategivubidobe.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/xomawebabidinuxafelewep.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/11131127252.pdfIn PDF document text
    • 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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 18508 bytes
SHA-256: 9dd916bfc9c3ee5b9c40602ab4f689e0d1fae7b75293aa91089936ec6409a93b
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 10632 bytes
SHA-256: d8829bda2884765c9f11bebf9040ae46f3cdf3109d46eb9df727f4e731bdb63a

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