Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a48cb148e5a4532…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 19:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7e7b4bbb55715a6e0ed8c8ccd883c90 SHA-1: f78a08d00c907c3111f51ae86935d2be3f26d6c2 SHA-256: 7a48cb148e5a4532269bb7e457a2a77c542b949f53c680eb059e22968a454fb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The presence of external URIs and a link farm heuristic suggests the PDF's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=how+viewed+my+profile+instagram PDF link annotation
    • http://centromp.it/userfiles/files/34455658621.pdfIn PDF document text
    • http://bptramptour.pl/files/file/kilirenipefogamiz.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/97302491471.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/64526984409.pdfIn PDF document text
    • http://cke.hk/userfiles/jusofoxenugiwawer.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/kuvumuwexatagekipo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b55023263---93320141067.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/kumoretuxi.pdfIn PDF document text
    • https://desco.scp.hr/files/82261638718.pdfIn PDF document text
    • http://oilspecchem.com/files/32330530014.pdfIn PDF document text
    • https://carlojans.com/cms/file/rofedu.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/vuwomeselobifusixu.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/82067679581.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/bumepuxifezegorupefoloxej.pdfIn PDF document text
    • http://thecuriosityshot.com/vosexidurim.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/lupujazuvisafumifumi.pdfIn PDF document text
    • http://stromzeleny.cz/file/30574112971.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/kutidugojiwevefe.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210901232526.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/23974293103.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9btug80ufocqpjav1ascrd5m53/77785892797.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xofimu.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/kifoji.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 17988 bytes
SHA-256: 39759786964c81ff52d708890e5681d57a7369e4db1b35462cc7830889d47391
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 11100 bytes
SHA-256: 928ab90457f6cbbd945d9ca49ff5d60569d49b42ef92e68fce2ea9cbc908d9df
font_02_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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