Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4101f0c01ca5a6b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 16:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67d5d86db7886652465cb1de532e4e45 SHA-1: c5b45806d1ced6f5fda532c249926b5fe0ffd34c SHA-256: f4101f0c01ca5a6b74c38aecd574bf3d719897a9b5ac0eb084eac82cee8680fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on suspicious domains, indicating a potential link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ambcavallon.eu/userfiles/files/zedivamidisegoxutefik.pdf
    • http://abwmountvernon.com/uploads/files/miwazidemivamobaboruvisel.pdf
    • http://teplorium.su/userfiles/file/85617192247.pdf
    • https://majubesar.info/contents/files/77260388636.pdf
    • http://starfishdowney.com/uploads/files/xoxukidimorikogezenujimav.pdf
    • http://oasis-inwaste.asia/files/file/sodegoluvemukol.pdf
    • http://cl-metalparts.com/d/files/60694741806.pdf
    • http://eviljoy.com/UserFiles/File/mukadoxafaj.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5in3eh9kd9llasckmhqg3i6jks/91117687033.pdf
    • http://lepetitjaunais.com/userfiles/file/96007842529.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/talotawopafejimilizasaguw.pdf
    • https://linhquan-group.com/upload/ck/files/runofugewewaliv.pdf
    • http://kdsonline.org/userfiles/file/rivibugor.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/vokepexop.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/nijutemawobazimutiseg.pdf
    • http://innova-perila.ru/upload/files/ramasorujamutekudas.pdf
    • https://shiokuda2.com/contents/files/fudopexusuv.pdf
    • https://lecachet.fr/docs/files/xatidenawuvabasakaxom.pdf
    • http://szintai.hu/ckfinder/userfiles/files/67511344454.pdf
    • https://alatheir.com/atheirwsfiles/file/92971730714.pdf
    • https://etevent.itweald.com/uploads/files/613e60faed62d.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38804232322.pdf
    • http://poslovniimenik.net/firme_data/files/69753011843.pdf
    • http://accessiblevehicleservices.com/userfiles/file/xujegezavobigububaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=types+of+arthropoda
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 16792 bytes
font_01_sfnt_off0000d56a.bin
56b22d3d47e695d16f0691c0851162661672db01f1f125926b4016ab003bd721		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 10432 bytes
font_02_sfnt_off0000ed41.bin
c831e5183bfc7bfe065bea459e3df5850a885814d1b92d0a06d593248bf3a3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 15764 bytes

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