Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e0b811f496fa43…

MALICIOUS

PDF

88.4 KB Created: 2021-05-12 15:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4c43c577e1ecf2bd1e17878779ec4f2 SHA-1: 80eebc7c92f0e921ac0c524c1d9f81fd99bcaaf4 SHA-256: 55e0b811f496fa43db680afc402e96c4b1889494d2cb6d9c67e1d5cccd9b40dd
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dafemum.ru/strik?utm_term=what+does+post+stand+for+in+baseball PDF link annotation
    • http://mapotilij.mygamesonline.org/53837163478.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/55142055765.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/41125907896.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/what_time_is_usps_open_till_on_saturday.pdfIn PDF document text
    • https://cdn.sqhk.co/kujaruwajovi/hmhejai/interesting_facts_about_disney_world.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/W1OiiAY/85226798599.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/hghgjgd/green_bubble_iphone_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_606ba2c3dbe5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_60180afc08d05.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/60409866240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fd04b05cd030.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/bourree_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/cggEifO/16746953616.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/berger_paints_color_catalogue.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
    • https://s3.amazonaws.com/nevovumowa/janowonediwipafazefuki.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/62645707879.pdfIn PDF document text
    • http://takolonopafa.epizy.com/when_will_fifty_shades_freed_be_on_netflix_canada.pdfIn PDF document text
    • http://wusuposakatoxel.myartsonline.com/boy_erased.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/gunadezejakijukodamaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/guidewire_testing_openings_in_tcs.pdfIn PDF document text
    • http://xafamikipu.epizy.com/princess_coloring_sheets.pdfIn PDF document text
    • http://vusanaxipunuli.rf.gd/alphabet_worksheets_for_pre_nursery.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/kavuv.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/apple_report_phishing_website_ahead.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 5068 bytes
SHA-256: ee8133d08416d6099d67a6e242d77725d1043f9b5f6ce0a14775929af272b295
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 11304 bytes
SHA-256: 127587859b5df89934a334838a04d2f90dd924aa7301e9c8816f9bf1f8ae4b54
font_03_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 16088 bytes
SHA-256: c51b2958dce69f609b0d0123f68962de621f1c5dcfc594b3115af3677880bf24
font_04_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230