Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd252735b5d58e5…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 09:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06a747010ae76bf355b33134fe28bca2 SHA-1: fa3d95b44b3a91560103e21624dbc08ba8ee3adf SHA-256: ecd252735b5d58e5552e7cadb6d7e0c66250384899321793b3508d4cd742a544
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one specific URL identified as a potential lure for 'bip messaging apk'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elhammagazine.com/ckfinder/userfiles/files/71648361167.pdf In PDF document text
    • http://boissee.fr/userfiles/file/malurumawi.pdfIn PDF document text
    • https://conrays.ru/f/data/23764368177.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gepar.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/jorikiterunigufezojexu.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/88309069669.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab85e9c2c---jigak.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8e5db1eb---tudipilozodunulitokavu.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/68865249382.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/88868257030.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/jimuwibufefipadixate.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26156595553.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86886077771.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76928261130.pdfIn PDF document text
    • http://alkanboya.com/files/file///24170079989.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84449489954.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/32525938837.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/16764680668.pdfIn PDF document text
    • http://shopabrang.com/images/files/49457184067.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/50783116457.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/zowadezowaxerolabom.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/13751062057.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///luxiri.pdfIn PDF document text
    • http://stromzeleny.cz/file/55946741265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bip+messaging+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_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 19236 bytes
SHA-256: 5c41dc21558765562d4ac769cff411b7766d90671893cc55c42807908170e1f9
font_02_sfnt_off00013888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13888 10376 bytes
SHA-256: 3062342ccbbb649446c9b41e83b863243abcc6a5d34de35b8227354d4751d5f6