Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a51bee6c7c5142…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 04:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85e578e9e9498dc72c6cb0949175a81a SHA-1: a8881e869c43265277c776b0dff6d17558719dfd SHA-256: 93a51bee6c7c5142863f1e15802c5d6e6ba458542ac8f0064d916abf9453ad30
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the presence of many distinct hosts and links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/zagafuzitevezanafev.pdf In PDF document text
    • https://rajatotogroup4.com/contents/files/purekorojupufozij.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/17611514234.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0876c577---vifafixopobigefo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/72215275924.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/89747658263.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/danipisewen.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/32217650620.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/32435843636.pdfIn PDF document text
    • http://iscelenie.info/files/file/32970589853.pdfIn PDF document text
    • https://ahha.az/userfiles/file/53338234370.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/lenoxeriponomet.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/padotalopulixodufip.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906091039.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/basejanuzumobusiraruvu.pdfIn PDF document text
    • https://europartner2.pl/uploads/50677734463.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/bumarevovegagelorexik.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/tusamufi.pdfIn PDF document text
    • https://phukienbep.net/media/files/finedi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/p95ljppg3gb3kmnnp999d9ath5/gowuladofenutiza.pdfIn PDF document text
    • http://dejede.com/userfiles/file/39727853203.pdfIn PDF document text
    • http://alltechsro.cz/files/joregifubularove.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wedowisetefomobiso.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109070101252513.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lukopufolezorenutu.pdfIn PDF document text
    • http://swhos.com/upload/files/zejemage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+i+see+saved+wifi+passwords+on+androidPDF 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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 17892 bytes
SHA-256: e31691e018816baf00e0a05bf1f69cd63b9a60bbecd34683a596b9913d0770a0
font_01_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 10528 bytes
SHA-256: 6a3c4cfbf932c96a62baf9ea16135b9268855014e3fe4aba910d48f604497f0b
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1