Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa7ab6fce148185…

MALICIOUS

PDF

69.7 KB Created: 2021-03-29 13:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 635dcf7d65e83435245810ec582bc471 SHA-1: 63cd6d86a82400e19c72d6a6422fb771a5a4bbe9 SHA-256: 4fa7ab6fce14818597fe83be1a54edf68e3eab08db563d50fae7095f702ceedd
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'workplace inspection checklist' and embeds a URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the detection suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=workplace+inspection+checklist+template+nsw
    • http://detonic-hypertonie.website/jobs_for_acca_in_london8d3tm.pdf
    • http://pycnidwzxc.info/wa_gas_tax_increase_2021rqmjh.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_6002846f2b6ea.pdf
    • http://forkidsshop.online/unreal_engine_4_medieval_assets_free9rh5h.pdf
    • http://checkmyscore.info/foxujexixujafogzcui.pdf
    • https://cdn-cms.f-static.net/uploads/4447916/normal_602117f88c017.pdf
    • https://cdn-cms.f-static.net/uploads/4394072/normal_602fa1bab27ba.pdf
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5fcbe031db3a8.pdf
    • http://classkaod.ru/sixitazupezesexurakak2vhvx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruxatavebokoj.epizy.com/42314115387.pdf
    • https://s3.amazonaws.com/lodazojamuva/checkbox_checked_and_unchecked_in_android.pdf
    • https://s3.amazonaws.com/tutapaxi/how_to_disassemble_a_nordictrack_1750_treadmill.pdf
    • https://s3.amazonaws.com/zidosozawok/43272840083.pdf
    • https://s3.amazonaws.com/sobaketemu/84176686800.pdf
    • https://s3.amazonaws.com/mokixetat/17883487129.pdf
    • https://s3.amazonaws.com/borokegujuzero/lodetugoja.pdf
    • https://s3.amazonaws.com/limepusotanal/coloring_sheets_with_numbers_for_preschoolers.pdf
    • https://s3.amazonaws.com/sewamos/34958951053.pdf
    • https://s3.amazonaws.com/medaliwifufugel/what_is_the_rule_for_1_4_9_16.pdf
    • http://gewajosakew.rf.gd/wabekor.pdf
    • https://s3.amazonaws.com/fedure/antenna_and_wave_propagation_lecture_notes_download.pdf
    • https://s3.amazonaws.com/zunewidimem/dedeletotakuvo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ea.bin
bd9157234a0cc55e0d66f19c0274460974390954b375a39423549a780de4bbf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 5344 bytes
font_01_sfnt_off0000e704.bin
a5bcba5c03b28d9891a780a389ba291b9c865fe90d3b7ac243fa08f1b574c17c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 10136 bytes