Malicious PDF — malware analysis report

Static analysis result for SHA-256 488c6d0893af957b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 20:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf4ef9d2b6a2949190ead7ca0fd1ed38 SHA-1: b2d070fab009eb064d117eea5e5bd7e75cf70cac SHA-256: 488c6d0893af957bc4a7543aabe515b5f837b48bf289f02623af550f950a0fe3
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, indicating a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting the PDF is used to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avatars.ru/userfiles/file/diniribexuwebukesoner.pdf In PDF document text
    • https://novinfasteners.com/userfiles/file/29269827340.pdfIn PDF document text
    • https://unitjaya.com/contents/files/89141728857.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/25559006223.pdfIn PDF document text
    • http://builderall.info/userfiles/file/11172932812.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/45184700826.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gagafodinopub.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7a5628f6---bemobikomivumizoxuf.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/93223234105.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/veligiwom.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/55895908368.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/jizejaxigerajakiririgo.pdfIn PDF document text
    • https://phuquiland.com/upload/files/43793368147.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8fae0fa60---10650661663.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/54164046239.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/tisofudabupodozurezaxuf.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/gogademimelimodelerufu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/65930648752.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/kesofexizojonarududu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/dixadogevawokolomufegari.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/ladorexeninekutop.pdfIn PDF document text
    • https://funke.be/data/file/buberubipoduwujufilike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fast+followers+latest+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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 10312 bytes
SHA-256: 6cd43c51b1e97df107342767544b7ed145e53e760b29a8648ccfe53d5d8d9208
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 17176 bytes
SHA-256: 727070f45732f31839e6d3326b26d216784cb0f4793a27116cc99af390bf0340

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