Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8532de9ffa2bcf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 18:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d3e11a8c6650a0ae2203599f898229fb SHA-1: 80be8817c707ff9b8195d77abac56afbbc347d50 SHA-256: ea8532de9ffa2bcf6b3e0bf341c120891406c9f5b3e7c99c52d386a7fc9650cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=pdf+eraser+pro+1.3.0.4 PDF link annotation
    • http://flagrant-desir.com/userfiles/file/jofibuzotofubum.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/14235356764.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/digosulelivokumi.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/34071170044.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109072314096204.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/92729807978.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/xumefazaviponit.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/98732951885.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dadawokorufebax.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/zulivowadomigobesagap.pdfIn PDF document text
    • http://portableandcool.com/files/files/jijulevifupetat.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/jerilatafiwame.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/68467986641.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161341bc0a97c3---jefatevopasegar.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/45050303468.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/21104826922.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/nofifasefetego.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/10934163073.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/79143933494.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/40326779975.pdfIn PDF document text
    • https://mattress-leader.com/media/17563835540.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/fapan.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fevuza.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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 10644 bytes
SHA-256: c630d979b2a22ac1d09733e991fc118d32ec506e0f5848e7ae682ec4283f130f
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 20036 bytes
SHA-256: a30f2565df60cf86303dc33579552e55b9a631c7a6f75da557a1973d5576f9f5