Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf5f27b3c8ca29…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 00:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3151b05e698f4b784e2708fc5f1abb7 SHA-1: 15d9b26e9ee4f2d518e2ffb6a8cb7358fe715e21 SHA-256: 6ecf5f27b3c8ca294ecf76925b377e3530847e3a5b595421ebbef9dd4d9b478d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one with a 'download cryptotab browser for android' UTM term, suggests a phishing or potentially unwanted software distribution scheme. The PDF's structure and embedded links point towards a link farm designed to redirect users to malicious or deceptive sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=download+cryptotab+browser+for+android PDF link annotation
    • http://uralcomservis.ru/crn_fls/crn_files/8655492424.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xegokosevupa.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/92068661464.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/73578149167.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/99964432442.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/lumatunixazojuweruzagaxix.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/mipixekokuwuvakev.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/kilabemoxowemomapev.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/42143622078.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///2628702084.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3109d38d6fb43c9d7f06c4ee08297951/bigum.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/lofiperiladelodanuka.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/41366938634.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/69845328108.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/53352185166.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/38943274608.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/rafugazuwigefonegek.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1632076160.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/65381197183.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/simuseno.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/badewiri.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/neganin.pdfIn PDF document text
    • https://successalpha.team/upload/files/nazirixanaki.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/razolarebilixizo.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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16540 bytes
SHA-256: 87e0a2c2a36527eefbc1306a4e467cb5b74b14eb5188622943b04124eb476eab
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10952 bytes
SHA-256: 009c18f08b92a3482bf7c9d299e4eea45b426cb6dd0b791b7f7d8d6f3218a4bc
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1