Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d384e8d85218d6…

MALICIOUS

PDF

76.5 KB Created: 2021-04-30 04:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e05e7cfe3ce8a4c12085b78fd405ba5 SHA-1: bc8f2b759e9f65accfd198f489fb9309deb54068 SHA-256: 24d384e8d85218d68e00fc5d4108680747d2e2fae94f5c3a314b643e572f4e7c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one directly linked to a suspicious domain ('zajinet.ru') with a UTM parameter suggesting a lure. The document body, though heavily obfuscated, contains references to 'Dnd 5e campaigns ranked' and the authoring application 'wkhtmltopdf', indicating a potential social engineering pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=dnd+5e+campaigns+ranked PDF link annotation
    • http://rubeatyshop.xyz/84779084406kp3lc.pdfIn PDF document text
    • https://mufiguxibetifo.weebly.com/uploads/1/3/1/6/131607440/xudagazez_zupikalerunude_zimotijelama.pdfIn PDF document text
    • http://trynutra.shop/gimemoruxexatuwotagediracq7m3.pdfIn PDF document text
    • https://nulenedo.weebly.com/uploads/1/3/6/0/136084055/6d33341cba754.pdfIn PDF document text
    • http://folejaf.mypressonline.com/toro_weed_eater_replacement_battery.pdfIn PDF document text
    • http://2220202.ru/95127793798dbnqb.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/78368573612.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/savegedefe.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/watch_a_discovery_of_witches_season_2_release_dateea0ye.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/oracle_database_12c_administration_workshop_1.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/nodakisumokivujeti.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/posuzepomufuwo.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/dakaxepitodufifexaror.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/adverb_phrase_and_adjective_phrase.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/12162668114.pdfIn PDF document text
    • http://hotita.space/wajeges4jhh7.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/pdf_text_size_editor_online.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/ginimexofaloxetisivo.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/kizugokofo/dallas_stars_twitter_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/ms_office_for_mac_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/will_harry_potter_get_a_sequel.pdfIn PDF document text
    • http://kijonag.onlinewebshop.net/56522272561.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/video_instagram_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/shakespeare_hamlet_summary_and_analysis.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5548 bytes
SHA-256: 909e59090588044c41b0b51e0c7487372a0abcfdb1319f79d0695ff2d7f19225
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10752 bytes
SHA-256: 5fbbd1138db480c1fe18b71a91e94f8c637c6a4611b3afe1fd87ed83abc78a73

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