Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a8c56201d3573…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 16:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ca38c61e6ccd1d4f18ae45e271f8d2be SHA-1: 8986a729f5c8c52399728b90fda984cc071a813c SHA-256: 3c8a8c56201d3573655c404d5b9468188e898b0f97706727d660e24783dc3044
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDFs hosted on various domains, indicating a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd3320a4d---widubeluba.pdf In PDF document text
    • http://paitoonbox.com/userfiles/files/xewurujekereda.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630926761.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/92824767105.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/48389083825.pdfIn PDF document text
    • https://zzhqhi.com/d/files/bivujuzeripenedibo.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/17397114039.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/33454676505.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/gidonumadod.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/35921135636.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/jereseworowixurofupipuli.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/rumufenajoxubovumemanobud.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/13857607150.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/85353907148.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xofetavexogasaj.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xokatura.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909170237.pdfIn PDF document text
    • http://yepuco.com/uploads/files/palowikuzofilupubukex.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/diwokizujirupobe.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/vexixerimekamar.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8799176846.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1meodq9dkl4tidj8hrj0n7q5jh/viwere.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/tudabisopazosukob.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210902_010607_116.pdfIn PDF document text
    • http://na3.it/misc/file/41621432686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=my+tom+2+game+download+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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 18072 bytes
SHA-256: 5f2a0e98c6dca0e8715eb0fe67571a0f39c5eba3a75df160c570591020802fec
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 10780 bytes
SHA-256: 4827671123c04b2f1b159a161b44f0f48f6daeae6975644365317d0c8bc79de7