Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c4bc42a1f41cfe…

MALICIOUS

PDF

171.8 KB Created: 2021-03-19 21:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74c9a4b8076e90f59b213b90c45b33bf SHA-1: 85d1a91b14a714447c99544a6aa777f7c6dbfb05 SHA-256: 76c4bc42a1f41cfec547f780812e2e70ef4efc0ee3ebd72ac5ce23708ef3c819
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to a specific PDF document, aiming to trick users into clicking on the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kuzutuzo.ru/award?keyword=nfhs+track+and+field+rule+book+2020+pdf PDF link annotation
    • http://antinomi.design/78671872457o8o8r.pdfIn PDF document text
    • https://lososegumupabi.weebly.com/uploads/1/3/1/4/131407698/kalimojo.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/wKwgjor/bible_verses_about_life_after_death_quotes.pdfIn PDF document text
    • http://bestsaleshopin.xyz/80010646197g5fw5.pdfIn PDF document text
    • http://instasavephoto.com/24412968334e7cqj.pdfIn PDF document text
    • http://sellforce.ru/92021270427o7wfm.pdfIn PDF document text
    • https://cdn.sqhk.co/fezajuwu/dpoIEia/12758042806.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/bukimadako-zijilidata-joluwavokulipo.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/iidKhaW/3114713914.pdfIn PDF document text
    • https://cdn.sqhk.co/pejibuti/GjgDGie/cocktail_table_arcade_games_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/leloxoreje/x3tihhb/final_fantasy_4_the_after_years_walkthrough_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/goxejake/qLhhhbn/bomber_friends_online_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/gjFgfNG/kaxagawe.pdfIn PDF document text
    • http://mastera-saydinga.ru/kabozifuvijimuxeropigufuxiqzdy.pdfIn PDF document text
    • https://vexebosarewasu.weebly.com/uploads/1/3/4/6/134699383/5a45f1381e6bd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7182edd6-9b9e-4e61-a807-e69b460d7170/fitbit_flex_replacement_bands_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7015dc9-72cb-44c0-b9b5-69c7efee0ba9/kudorofoniwuroxosabanezeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1698ee7-954a-4606-aca2-7ffa289e2a6f/futosusetigenoritop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262f4f99-208f-4c39-a5fa-adb0c28ad95f/xamir.pdfIn PDF document text
    • http://fosixijikalapi.epizy.com/polyisocyanurate_insulation_board_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f6d8ea-3972-4f0e-9f4d-318690345782/mr_lee_water_cycle_rap_lyrics.pdfIn PDF document text
    • http://bututifeb.epizy.com/internshala_resume_template.pdfIn PDF document text
    • http://lejugolidisixod.rf.gd/exercicios_alta_idade_media.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FD8 5688 bytes
SHA-256: 7436dfd7897f44c517de1d124df871fdc17cf30d1be9315daeeff9056875bce0
font_01_sfnt_off0002632d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2632D 12208 bytes
SHA-256: a2d03e54284af91537f0932b50f10eafd879562fbc1df4f39d01c7f9a3db4e77
font_02_sfnt_off00028c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C2C 16084 bytes
SHA-256: 71b60fe79f15a92e269086d5fcda920ffd52a1257b28caebd543c99a6d119fe4