Malicious PDF — malware analysis report

Static analysis result for SHA-256 a457674dfb1b9ccd…

MALICIOUS

PDF

71.4 KB Created: 2021-03-06 03:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13bbaa6638d04a3e5f6c7fa3e1dc7aad SHA-1: 2bd2181eb246fe76ee9366fe5854cde5815a8b11 SHA-256: a457674dfb1b9ccd3cbd86fc49dc72ded4a9f8d9bfae9cdab13d4b5063e04b10
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 0.9997

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://lozipotod.ru/wix?keyword=diagnostic+bacteriology+a+study+guide+free+download PDF link annotation
    • http://geleostone.online/pioneer_fh-x720bt_factory_resetyrh70.pdfIn PDF document text
    • http://marinarus.space/florida_ehliyet_El_Kitab0qu27.pdfIn PDF document text
    • http://update-win20.online/sumasejegupemavakik1im27.pdfIn PDF document text
    • http://contact-git.top/what_are_the_responsibilities_of_a_public_relations_manager3mots.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/lenub.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/75000889455.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/does_stock_market_open_on_memorial_day.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hWhcjeQ/90981710887.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/the_jazz_real_book_sax_-_eb.pdf.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/danganronpa_reload_ps4_trophy_guide.pdfIn PDF document text
    • http://balonedud.iblogger.org/asbestos_roof_sheets_risk.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/Ngfggsk/zazevemibe.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/focusrite_scarlett_2i2_usb_audio_interface_review.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/ChhHhdT/jiragefodolijafoneranenaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabekexivebinef.epizy.com/70114641270.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/minn_kota_ulterra_112_36_volt.pdfIn PDF document text
    • http://giwolexuki.rf.gd/avatar_3d_digital.pdfIn PDF document text
    • http://fawogalupa.epizy.com/mofibibinemitumitabiremis.pdfIn PDF document text
    • http://kenubuw.epizy.com/bridge_to_terabithia_text.pdfIn PDF document text
    • http://fewetero.epizy.com/jotaziwinixuniw.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 5520 bytes
SHA-256: 5a835e2c9c6826091618d2de5f5a12b3c404b5cb5d519b8c1bcd7b8827140f5a
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10916 bytes
SHA-256: d7b7068ea3288c0c38ebc17fbc75bde5121c9acc941990041ac851e8a27d7a27