Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d4737063fb4fb2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-16 09:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8044af659e373e436638a562a1c13ead SHA-1: 9b00c3440934bf7dfc09cd3a59bed3c447493a4f SHA-256: c5d4737063fb4fb21c2d030eafbe7dc31f41bac5cf180489bd0af7e3af84adb7
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=fundamental+trig+identities+pdf PDF link annotation
    • https://cdn.sqhk.co/vaminika/Xapehjb/meaning_of_idiom_jump_over_the_broomstick.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/gicjggh/food_truck_restaurant_kitchen_chef_cooking_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_6002967c0e54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_600fd6a53ef13.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/medical_ethics_in_abortion.pdfIn PDF document text
    • http://winepazijabubov.22web.org/ohaus_scout_balance_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_6003ce011aac7.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jhjoEe2/rush_show_don_t_tell_lyrics_meaning.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/leritupatisuboxobavez.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/ieihqhb/zivugiwonemovefeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5ff857f6c54ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_60302ffc4d9a1.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/5M1Loea/marco_s_pizza_lansford_pa_menu.pdfIn PDF document text
    • http://tekeriset.iblogger.org/52579368610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_60113b774f18d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jimatupobosubu.rf.gd/migufuvev.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_54bf9e664af047f6a1eca7f13b5d35d6.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_4b4224fb554a4ae1a116331e79ab1b6e.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/42567377605.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/mumeboxusufejedativurogez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 5088 bytes
SHA-256: 87fffe2997915276c1ea78f23773e04c9530fda82c7791605ea5f1ced7313d47
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 11788 bytes
SHA-256: f0c658f6ecf4cf804b26ad67785a4e2ffb466949c39fa344a72623d5984167ef
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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