Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d8b79264224364…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 10:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c293b40b872e3e5c602630660de02253 SHA-1: de0435791fa046a8b4d333d73f8f58af6a4d7f92 SHA-256: 78d8b79264224364df182d1a0133e7ae1316f769bee1623d840a4e846548bdac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Numerous embedded URLs were found, many pointing to domains that appear to be part of a link farm designed to obscure the final destination, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://designbeginnings.com/upload/file/69703335023.pdf In PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zisoxitupov.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3ddc0b88b---73853917645.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/24339276995.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/penidijasomupawos.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/34565319812.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/28362289365.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/larero.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/38279159768.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/kurofipiwelaxorage.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/guratojataxudinevanetufap.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210906_E41CC91664DFF0FF.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/givuke.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/51646418666.pdfIn PDF document text
    • http://akademibt.com/resimler/files/jumufavibexubasafimin.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/49644242584.pdfIn PDF document text
    • http://wwstationery.com/files/file/xupekofifemesunovuzupimeg.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/tuzujalavodozunogowitewer.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///pometi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///25064598034.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/25555493628.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090810003961.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60491576520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=truecaller+download+mod+apkPDF 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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 17104 bytes
SHA-256: f9a34b2ecda86c96cb29b68aac9d2698ac81b6a8e96ed996f89c4450961db582
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 10560 bytes
SHA-256: 030540ac6665e304a4d596c6428c8b101809e4551a9f1e772f3693831fde60cf
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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