Malicious PDF — malware analysis report

Static analysis result for SHA-256 615a06c50249158f…

MALICIOUS

PDF

92.3 KB Created: 2021-04-06 19:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 21edc511aa6d5d6e7bae58a0efbd4b30 SHA-1: 56976a1e067b5074b0fb33805fb6d6545b815ff6 SHA-256: 615a06c50249158fa9136b3448702ceea17663a1c3d0f2b0e7f08c1f5291491b
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 0.9998

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://mezovuduw.ru/award?keyword=cacique+tango+brasileiro+pdf PDF link annotation
    • https://cdn.sqhk.co/getabemuto/3s1PZ3r/smart_to_do_list_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/xuruwivagezu/hahi6MG/aadhar_card_correction_form_fill_up.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/fakawilutorofusiruzunav.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/simile_metaphor_hyperbole_personification_worksheet.pdfIn PDF document text
    • http://hookup157.site/45563189163afhsd.pdfIn PDF document text
    • http://tubujefowabe.medianewsonline.com/xefilufubezolepinekejagi.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/d7jiiiG/35052226241.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/math_dice_games.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/ehhLhdB/major_militia_war_mayhem_mod_apk.pdfIn PDF document text
    • http://vodoroding.info/11350205461e37zo.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/english_speaking_notes_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/fhdjhxo/alarm_clock_mac_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujevudaxuxos.epizy.com/anari_film_all_song_free.pdfIn PDF document text
    • http://vobafuge.epizy.com/16194265260.pdfIn PDF document text
    • http://teporududa.rf.gd/ethical_issues_in_counselling_essay.pdfIn PDF document text
    • http://xejipej.rf.gd/18149957219.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/chemistry_form_4_chapter_3_notes.pdfIn PDF document text
    • http://taluzeze.rf.gd/auto_tune_live_full_crack.pdfIn PDF document text
    • http://piduvazudofem.epizy.com/4232342592.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 5496 bytes
SHA-256: 56c91d370e3e3c363c56e5d0042e35baae9a9dceda3c5e74171239ac20e33840
font_01_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 14776 bytes
SHA-256: 52c75e1c29c3661d79740273d11a7111cb1bda72c3d59e840182832f1d69d5f2

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