Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e2e95c40b57bf7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 01:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2831607f1863ca2cb1c81b1a54bd724 SHA-1: e4bcf70f4bccddd8c3f97beadbda3e59e06b8c97 SHA-256: b8e2e95c40b57bf700602593588e79f8aa30d3327eaa760e37f512f99025acfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm structure with numerous links to disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs reinforce this, with one pointing to a known link farm and others to unknown domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/80899280748.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/jewotavibaxaramosefure.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/vomuwakafelakodifiwamerik.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/jixupunasamajajitipu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/86818275720.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/gibijejirofumonijilimopes.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/garobupiselosexerixeziku.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/reneru.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/juguzefudo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/tebuwef.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/83713452392.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/zokejazodifi.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901153756.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/989df4d9b67bd7deac2bfe15b8793251/86259902495.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/4795348196.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/47515252532.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vafisabig.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/majuluxiwenilasereka.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6efecede---95502190626.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/72146616929.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/komodexuvanojoji.pdfIn PDF document text
    • https://bold-iot.com/uploads//files/202108021812549778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=el+imperialismo+lenin+pdfPDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16484 bytes
SHA-256: 7e48c7607597cbb4d6f10b635e1010e36e7941a03c55f32c3818e007550b201d
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10544 bytes
SHA-256: c5983f0f8280b0f3c75f711d67fd09de4b42f305d22b4c7bc1eab5b5e0d8d68a

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