Malicious PDF — malware analysis report

Static analysis result for SHA-256 694aba17b1139bfc…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 02:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25e3cd0fa1d0a2cf400d1df476a9740e SHA-1: 0a9bbd1e62e6732e6781a3343b789f946e544e5d SHA-256: 694aba17b1139bfca2c88d0d5f71ba5921d4dea6cf1e3b4e84e22b19de6e03fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://joltiy.ru/uploads/files/94998478859.pdf In PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/98639720719.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210916030139.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346006080bf---5448708383.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/89492573134.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/20218184472.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/fuvokesepev.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecc26df6ef---topanexibudav.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/26238462165.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/kesikopuzavosiloril.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/womidexepas.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/25235051451.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/wumawel.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/80166853989.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/75943020889.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/1810764679.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/finitupugagir.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/13559064354.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27236807274.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/kifogofarokaxowebun.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/81075810319.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/46323589345.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/22221282959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ab79a177---45952081344.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/kakawo.pdfIn PDF document text
    • http://czyxchem.com/upload/files/3936234330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+ocean+is+home+mod+apkPDF 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_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 17296 bytes
SHA-256: 194be67eefe6ef45d1e572f20defa8fc2bdc52ff9d31fe494328d4240b173ada
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10760 bytes
SHA-256: afd05efdd46c5a100cb0ac3006b9dbee32e8841d8a21122f374de074c77ac7fb