Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c865fde1a05b691…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f0e110bd04abf210fbbffe585beac46 SHA-1: 6a543282b47a857cd483cbcd2d53a735f1104c6b SHA-256: 7c865fde1a05b691bce44151856574443e28ac5a750cfb2bc4fa8613583fa8d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://inwebjor.ru/uplcv?utm_term=android+serial+communication PDF link annotation
    • https://cmf8.ir/data/file/95093014453.pdfIn PDF document text
    • http://k1a.ru/images/files/file/48876057881.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/87856739153.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/matemebu.pdfIn PDF document text
    • http://odumakus.com/uploads/files/ropenuta.pdfIn PDF document text
    • http://parateam.cz/file/nupokisufi.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/werokokaxupaxutaw.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/34582990725.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/sofagarimesenedigula.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lanurexe.pdfIn PDF document text
    • http://sbairs.com/datas/files/9169552010.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/nadodalo.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109091059163602.pdfIn PDF document text
    • https://citytrafik.nu/images/file/6425575449.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8697mpatgsijlhdlrt16577n54/jizowimajon.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/tebunok.pdfIn PDF document text
    • https://scalping.ir/data/files/file/78443434250.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/88509676551.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916033410851075.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/1189411454.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16308823978794.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_off0000bbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 10612 bytes
SHA-256: d5518c5a41732363b22cf277657c4fb4313b4be83b0acc16e6e551aa0296ce99
font_02_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 17464 bytes
SHA-256: 7877ace4bf685aa0a3c20c2c5679c1b18f8654bd882872d140f1dab79f71338b

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