Malicious PDF — malware analysis report

Static analysis result for SHA-256 259605b174913019…

MALICIOUS

PDF

85.5 KB Created: 2021-03-19 11:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b4d5026294af285aa78e5592753720d9 SHA-1: 233fac393338aaec36c0075369f110faa56ece5b SHA-256: 259605b1749130195961a70a861f3008cf15825ecee19a7daaa9b17d00f41f73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting or domains associated with phishing. The document body, though heavily obfuscated, appears to be related to software downloads, suggesting a lure to trick users into visiting malicious sites. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://baarspo.ru/wix?keyword=airdroid+apkpure+download PDF link annotation
    • http://winwites.space/embraco_refrigerator_compressor_wiringmnywx.pdfIn PDF document text
    • http://50offstore.info/basic_guitar_chords_chart_for_beginnersltokh.pdfIn PDF document text
    • http://housefashion.ru/ratexifazexepebadolex01497.pdfIn PDF document text
    • http://berabujadew.22web.org/asian_tv_app.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/maths_book_for_class_8.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/robin_hood_2010_christian_review.pdfIn PDF document text
    • http://pressit.space/kidobonebegifodatuzivimec10y.pdfIn PDF document text
    • http://nubolutlion.xyz/how_to_use_samples_in_garageband_ipadw6c42.pdfIn PDF document text
    • http://tehnopolis.org/among_the_impostorsjs5aj.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/history_of_seventh_day_adventist_church_in_zimbabwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wuwerodewepejij.epizy.com/power_cord_for_hp_deskjet_1512_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/2595051606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57366e4a-e0f9-40c9-8933-2ee472088217/canon_elura_100_user_manual.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/13316470095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2770eb1c-eb62-459f-918a-2016363119d6/64066326142.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/engineering_costs_and_estimation.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/zeramaweleweduvolikab.pdfIn PDF document text
    • http://kajonefev.rf.gd/which_countries_have_a_codified_constitution.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/what_are_the_advantages_of_strip_cropping.pdfIn PDF document text
    • http://gusabonatixuk.rf.gd/how_to_find_bond_angle_trick.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 4720 bytes
SHA-256: 1d0d58850266b71055c01d947efa88db8586544df1108ec62c2af81a4f3f0422
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 11448 bytes
SHA-256: f226d52add596f2da9ae923f970c693712271e7a4c5d2a5530d9b4f747ab359d
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_03_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176