Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb26aadb2be609a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 18:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41b6679d590cf8bd710a4218af09ed67 SHA-1: ad51373781e496ab1f9bd61f0cea0a3af583a10b SHA-256: ceb26aadb2be609a7c8a1de5ab2783dea81c29c52e15be1b395d16d7d0490080
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded links point towards a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://austria-ex.com/images/blog/file/5922482915.pdf In PDF document text
    • https://vleek.com/uploads/files/62172283503.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/88619304557.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/13774797306.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/butib.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/66057101664.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jabixukukidefobe.pdfIn PDF document text
    • http://hrudolf.com/userfiles/rurabokogenodeve.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/23814492911.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/26108121190.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901054928918252lp0trki0gfip.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/33396106514.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/98749746313.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/24963838214.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebce004188---88742000115.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/28457110255.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/fososajenewikenipa.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/33036985498.pdfIn PDF document text
    • http://bluebossa.pl/files/file/sawusijojozajogunopixoj.pdfIn PDF document text
    • http://isvpro.com/custom/files/34607450379.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/kopel.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/zoxibezilogapenunulokuzi.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/sivuja.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/46397768480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=outlook+for+android+phonePDF link annotation
    • 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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 10644 bytes
SHA-256: 18c5b9aafb641175272827c6826b67b2c444d32553b2654f8aaf89804c96cef1
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 16408 bytes
SHA-256: e2a2b9c256b46f53c97feac7b78ce42e3d49f87654f5bd321d55905c3a48d513

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