Malicious PDF — malware analysis report

Static analysis result for SHA-256 938c0ea449f512d5…

MALICIOUS

PDF

95.4 KB Created: 2021-09-17 16:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7fc2435c235a9f37afbf2dc5fa2dd81 SHA-1: 88f3cc2606bbc9a4321453718280beac9694a2e2 SHA-256: 938c0ea449f512d563093a552347119d8d276820c48c06364fdc8cd489e630bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, often associated with SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=lizardmen+6th+edition+pdf PDF link annotation
    • http://ninda.vn/userfiles/files/56544425721.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a237def91---7610292402.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/ferigepa.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/88395139562.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/lureluf.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/reperofisez.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc3d589a5---govazipiwafaxuze.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xagozonumikamifova.pdfIn PDF document text
    • http://technocom.pl/editor/file/tuxir.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/90798097559.pdfIn PDF document text
    • https://argumentua.com/i/file/xowox.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/lerolalodalitarupug.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/givazuwuxege.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/68539493442.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mesatet.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/86785858035.pdfIn PDF document text
    • https://medpressa.ru/files/file/konalepagu.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/33701286637.pdfIn PDF document text
    • https://hinaweb.com/upload/file/gufekewiviromivutufil.pdfIn PDF document text
    • http://skncn.com/u/files/jikojalenokajomoserizuzun.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/dazepomixebajud.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/finotanuladonodo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 19452 bytes
SHA-256: 4c19ffa1871ebd3904bb84b22064bae942b9d7d6c469111a6cc04e36d61e972d
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26
font_02_sfnt_off00013f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F11 10732 bytes
SHA-256: d8432f100f3b8af2c00a7bdf5f488e14511e60cf272d7069668572fba78d823b
font_03_sfnt_off00015785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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