Malicious PDF — malware analysis report

Static analysis result for SHA-256 844323c7376acaed…

MALICIOUS

PDF

91.9 KB Created: 2021-03-18 09:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4a4d28d922319b9bb2f68ea15a8ef8fd SHA-1: 7910cfaba10d442f10d0d7eb0d74be1eb16e62dc SHA-256: 844323c7376acaedd00450847a8e363c8c14a955ce08004b02fa6bc9d6f2adde
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=7th+grade+science+final+exam+answer+key+2020 PDF link annotation
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/eaa0c8.pdfIn PDF document text
    • https://tolubezilonis.weebly.com/uploads/1/3/5/3/135348590/a1230d.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/does_starbucks_have_sugar_free_white_mocha_syrup.pdfIn PDF document text
    • http://agent-ritual495.online/66908518268piujg.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/jugobominavovos_dikevapute_nilavekigase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_602c7ae132a0e.pdfIn PDF document text
    • https://malizopal.weebly.com/uploads/1/3/5/9/135962708/gedexewavorumamem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_6002963b6dc6d.pdfIn PDF document text
    • http://teagreen.space/best_nail_salon_for_natural_nails_near_meb8jwb.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/eijdigw/hollywood_action_movies_2017.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/5995934.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/architectural_plans_for_houses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5fccb05b08220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_600370a4e5b00.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ic9hghi/48768200579.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/VDNijic/rome_total_war_2_desert_kingdoms_review.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/73391463816.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/where_do_chicks_come_from_book.pdfIn PDF document text
    • http://bostpolamos.site/teaching_vocabulary_esl_lesson_plansrk08z.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/how_much_money_do_nfl_players_make_if_they_win_the_super_bowl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/10806147296.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/bst_timesheet_app.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_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 3116 bytes
SHA-256: 838ce8967f2728ae4f98ba7450ae8e181c68cf018abc9acfed33c313df0ddb18
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 6020 bytes
SHA-256: 9cce58c99b2c16f191e9f6325dc7d3770c3a3f0c83c09e59b95c590e90b7c051
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 13036 bytes
SHA-256: f61ea18b6a3e343ea6f0aecf5b35078553d35bf98cac169fd57ee37d23f6e44f
font_03_sfnt_off00014966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14966 16432 bytes
SHA-256: 505e625bbf1f4fe131996abdb6f54d745cd7c0c68517c72c51f611378ea244f6