Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0a56fc9058a248…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1655cba91d028d62d1898ce60c8036d3 SHA-1: ebdba7e09d88f13ec3dd513c669468546af2b9bf SHA-256: 4b0a56fc9058a24865c0ba9b5d7515fd961ab4f5cec0496625385ec15f53bf12
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=android+1+gta+3 PDF link annotation
    • http://hiredriver.com/uploads/assets/files/91750806932.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/delikugixozutajunerafita.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/48561537832.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/80832038169.pdfIn PDF document text
    • http://mobiliteit.nu/files/7475044608.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dowegugi.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72830965424.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zepip.pdfIn PDF document text
    • http://anm-av.de/uploads/files/55594121966.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426f6678e2d---tavomaw.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/7405830475.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/paturanez.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/32938534004.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/3979879031.pdfIn PDF document text
    • http://bndweb.nl/upload/files/mojetet.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f93f19a3e---55732638123.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/janefuwodinopesoba.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22562124926.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/jekuxisi.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/57004672562.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/58480594999.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/59657659714.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/70152496097.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/64929107932.pdfIn PDF document text
    • 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_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10280 bytes
SHA-256: 45cd7a447a59576f023c930ea3c8a36496365fa75dcb7ba8baf37af76d47afff
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 17380 bytes
SHA-256: ddaeaca591b9c427ab783d55a1b9d8ee9989cff49a8c35128d76663732d54ffd