Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90d0d1179e66e13…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 05:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 600e3232a434fbccc080a39bc47712bb SHA-1: ce1e116842518fb98a708cb8131f33a640a0b57f SHA-256: e90d0d1179e66e13d36edea603ef1ee9d6fe482b7356fff4c29c44122cf2e9a8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be link farms on disposable hosting. This suggests a tactic to obscure the ultimate malicious destination or to distribute multiple payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://korean-school.hu/hangul/userfiles/file/jujikotokadurufisisa.pdf
    • http://www.primariasantana.ro/uploads/file/16555426192.pdf
    • http://cudicio.it/images/file/94306271967.pdf
    • https://mamotato.ro/userfiles/file/medononu.pdf
    • http://hilimall.ae/uploads/files/10368788165.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35a2857a3---lojagekuxojezusawijer.pdf
    • http://telekommarketing.com/firme_data/files/17710032713.pdf
    • https://ud-hobby.com/images/Upload/file/49033593119.pdf
    • http://stauarchitetti.eu/userfiles/files/damofuwetit.pdf
    • http://aircond.md/upload_fck/file/19009530865.pdf
    • http://k2plusinterior.com/userfiles/43225470610.pdf
    • http://korealabels.com/ckfinder/userfiles/files/50645174491.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/71809090462.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/nanelesopalubudu.pdf
    • http://a1-automotivegroup.com/upload/files/5732037619.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/40567291775.pdf
    • http://schokoladenfontaene.de/idata/pepasozonexiv.pdf
    • http://cuanhuadanang.vn/uploads/image/files/runuv.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/dutudur.pdf
    • http://profesniprukaz.cz/ckfinder/userfiles/files/ramudakatepikovuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=electromagnetic+spectrum+lowest+to+highest
    • 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_off0000b9e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E1 16792 bytes
font_01_sfnt_off0000d1f8.bin
614d9f0fc4a6899c49da2cda8d53a22c5f9b0f9ba7477de60029cf51df99bd62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 10988 bytes
font_02_sfnt_off0000eb5a.bin
90b64a108ca9a5f10c18cfc37a019fc2ea96d7e257d9c55fa43d01545db631fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 17472 bytes

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