Malicious PDF — malware analysis report

Static analysis result for SHA-256 344fc327a24cde83…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 23:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aff5ab911a99b45409481e7707d4aa48 SHA-1: aead233a48c914c2fba735f7a1b298fa4f96564f SHA-256: 344fc327a24cde83e290721253ee590d207197a08bd46549d91b50663cfdce7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5512f06---jopepu.pdf In PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bipowukawexezu.pdfIn PDF document text
    • https://cooperspick.com/files/22095392763.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/saliletipinitavob.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/rowegimosekewob.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gadorabe.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/90189398934.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/92204678950.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/bezamokekazewarif.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/95870017936.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/27372016346.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/78997214665.pdfIn PDF document text
    • http://101balkon.ru/upload/files/zilidu.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/polilavitukuwivix.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/runogigumegip.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/76777200060.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/69206948202.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/gapek.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/tenemuxujorobelegikitis.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/69031881971.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/29944424388.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/70021443452.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/29346982163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+go+mod+apk+download+for+android+2021PDF 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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 11048 bytes
SHA-256: 4cdcdcfba31e551179f43e55a213e5ca78483b0deebf3fc4e7deb5d534d32b31
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 17992 bytes
SHA-256: 9047e30337d79480489cee1506c1cef658254438b0f70134056b5be64e324bf3
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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