Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b58e2bcc00cd77…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 12:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe592c26fc2380029ee21e989e7e22eb SHA-1: 15a7e58a1cc20b0b14093f75dc9064db4be327a5 SHA-256: 31b58e2bcc00cd7730cc4781d06b0b3a622c2201f2295027b63a78991bc06c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's designed to exploit vulnerabilities or trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=instagram+reels+for+android PDF link annotation
    • http://viswinkelindex.nl/images/uploads/faliseb.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gejefuvum.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vizora.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/94393830804.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a307d6156f---texab.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/23364257533.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/getekisimekezeloni.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/99872003822.pdfIn PDF document text
    • https://maria-galland.ru/files/file/28732956231.pdfIn PDF document text
    • http://net-work.cz/data/file/tevavewemotigofifako.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/xomasil.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/zomavakexizesizomenanegeg.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/81113819893.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sebuvizavasexuvofajuf.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/penubebuvatomegis.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wifagolinujujoputitinate.pdfIn PDF document text
    • https://sergiomauri.com/images/file/binutolomedizuxus.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910202132.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c2a0d1fcf5.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/nadelerojipimem.pdfIn PDF document text
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/44414801455.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f249b81f---dipefifawitenadiri.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kotovekaxelibudijodel.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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 10648 bytes
SHA-256: 52220998c8798ab7fcd263dd58712a6af085292d327bd686c40cd7ce23cd55e0
font_01_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 15316 bytes
SHA-256: bc591dfc451fc633e5c996286914f5d214fdbdc6f764e2d9cb4b1a6ee24e17af
font_02_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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