Malicious PDF — malware analysis report

Static analysis result for SHA-256 19528b2ad38c5788…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 12:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8d792c7a668e0c3ec86ca77d5b7357a6 SHA-1: b82a58db324bfedd9d7721bae37637123b1652cb SHA-256: 19528b2ad38c578850eee6903c51a99ae6f7f16a6a40189334edb7765cca4030
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to PDF files on various domains suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://backkwang.com/userData/board/file/63646888278.pdf In PDF document text
    • https://salwangurugram.com/files/11748133832.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/77609709811.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/61814817326.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/18982951040.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109090212023788.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mozagibupofa.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wiwubiz.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/16244041924.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/mavavatinimegutewamutu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/daxokibaxaliwizumitape.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/67667246767.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/pupukodu.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/fimogofibilegodeg.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/tajujiroxajolojo.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/vosukun.pdfIn PDF document text
    • http://marine-inox.com/i/File/24476613705.pdfIn PDF document text
    • http://mayjack.com/upload/files/40547009145.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/69073224003.pdfIn PDF document text
    • https://sergiomauri.com/images/file/90394061281.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/37481183594.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/99261937688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sony+xperia+p+price+in+sri+lankaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16856 bytes
SHA-256: 087cfbeed1b86f963f23fec37a5ceccb1f8cdf434fedf6b48f1b2bc9411fe017
font_02_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 10652 bytes
SHA-256: b3fa36a9a7f6c8da30824b059a4315894120bec11948456d6307a24982101cce

Open this report in the interactive analyzer, or submit your own file for analysis.