Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb93f42e8400f6b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 01:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee3f090a7112c2ee071442d5f81b7329 SHA-1: 1006fad048ecc779e5387a24d9f8e5c9823fa0aa SHA-256: bcb93f42e8400f6b73dcd43260d6d0f93412dd9822d543d5a28ada28caff0bf0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its small size and image-heavy content. It contains numerous external URIs, including one pointing to an IP address, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to trick users into navigating to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://idrogastermoclima.it/Utentifile/FCKPage/file/fisudokuvin.pdf In PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fugidazunoxusovalazuvol.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/7195922698.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e15b41a51f---73227163165.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/92919691695.pdfIn PDF document text
    • https://vientangluc.com/upload/files/36633315228.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/43521231412.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/jumun.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/belagixegape.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/vavopoperuzoviveliwopeje.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/66838880179.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/94560653703.pdfIn PDF document text
    • http://chinalabware.net/d/files/pabevajegoxulakimaveri.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/vijosusuvasiga.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/ketorexirebuvudiwurosij.pdfPDF link annotation
    • https://kotata-zlin.cz/obr/clanky/file/lasaxibisetabanemuj.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/19/file/dafakirok.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/favezidagedatazenonu.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/39109323825.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/97538144952.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zaritulebaxuke.pdfIn PDF document text
    • http://reylab.com/userfiles/file/damalovesobaduwezasopode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adobe+photoshop+cc+2019+crack+amtlib+dll+32+bit+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_off0000b200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 11712 bytes
SHA-256: b8faab60b3d59f03f4a1512a2bd04cb692861322e92eb7443860b23a8a01c389
font_01_sfnt_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 14032 bytes
SHA-256: 4122024da00611e38eecb12ce8e8ba14139ef73b89fea973dcce84b1cd4d322d

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