Malicious PDF — malware analysis report

Static analysis result for SHA-256 381dce14f0f62b91…

MALICIOUS

PDF

71.1 KB Created: 2021-04-23 14:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b6b572f9a8f9b11e34aa99fb8a730f6 SHA-1: 5b0c4530a72b166f49e5bbc854625837ed8b88ca SHA-256: 381dce14f0f62b91ccc2d7e4303faf8de07335b524dc91ec28e5105e552241f1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://fokemale.ru/strik?utm_term=jb+gupta+electrical+engineering+objective+book+pdf+free+download PDF link annotation
    • http://gepokupaburorew.mywebcommunity.org/23753095770.pdfIn PDF document text
    • http://electriccannoz.club/need_for_speed_most_wanted_android_requirementsxqr9g.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/yZmkjjx/free_flower_wallpapers_for_your_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/cgeMsiI/play_online_fireboy_and_watergirl_ice_temple.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • http://ehaberdevlet.com/203985355578oaer.pdfIn PDF document text
    • http://azalea.store/xuvobuwesalarepajojezns4qk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibakiwijikilok.rf.gd/amanah_dalam_islam.pdfIn PDF document text
    • http://vufuwulofakugef.rf.gd/39398892990.pdfIn PDF document text
    • http://vejawotivifima.rf.gd/how_many_knots_equal_mph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839e7329-1aa9-4ba9-bf46-ee878c57b1df/nepekironefiruxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537af5df-0250-43bf-b8b5-30aa5bc50674/what_size_drip_pans_do_i_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858fd695-84ef-4da2-afff-b111a8eced52/mupotabaregipozifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b90f628-f0ce-4f99-93ae-d3524629fbb4/el_pollo_loco_menu_price.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 5564 bytes
SHA-256: f47e6c7c477455fe5ff78888a1875c36bd786c68d7edc295569a932cbf30679e
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 10520 bytes
SHA-256: 15fa3cfa982470a24a761ae338ee95366bcb40ff6c80838910d4a939440c4810

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