Malicious PDF — malware analysis report

Static analysis result for SHA-256 9081a8c33d103b49…

MALICIOUS

PDF

87.1 KB Created: 2021-02-21 23:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: bd99ad21a448f3dbb33239a0975eb118 SHA-1: 051f73fee20ae5d29a6c700079b61359811a7658 SHA-256: 9081a8c33d103b49534e466f5df0de5794a5201a8b9488ae87b6f9aeb9f4a9ad
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=electromagnetismo+en+la+vida+cotidiana PDF link annotation
    • http://buloshnaya.site/how_much_do_a_life_coach_makejvxw1.pdfIn PDF document text
    • http://milanomoda-italy.website/4396972058036la3.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/0868081955b.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/fuxigumusoba.pdfIn PDF document text
    • http://raifaisentgo.online/armando_alducin_librosohpdt.pdfIn PDF document text
    • https://pesosadat.weebly.com/uploads/1/3/4/8/134885101/932fc.pdfIn PDF document text
    • http://koteyarn.moscow/kalnirnay_2020_marathi_calendar_download_for_pcmy4dt.pdfIn PDF document text
    • http://stikc.xyz/d_link_dir_868l_optimum0ujs9.pdfIn PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/fawedajekofubu-sunomutatos-zedefuraza-xigolekezalagu.pdfIn PDF document text
    • http://ttttrrrr.space/privilege_power_and_difference_3rd_e9uwxp.pdfIn PDF document text
    • http://allfreebets.ru/sermons_outlines_notesucovg.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/napikaycfk3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxuramubot.epizy.com/report_on_beggary_in_pakistan.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/types_of_selection_worksheet_answers.pdfIn PDF document text
    • http://guruwemuzotal.epizy.com/built_to_last_tattoo_griffin.pdfIn PDF document text
    • http://bozisiruvaletun.rf.gd/formation_chef_d_atelier_enseignement.pdfIn PDF document text
    • http://vukefuxi.epizy.com/where_do_extrusive_igneous_rocks_form_answers.pdfIn PDF document text
    • http://dulijamepor.epizy.com/20497589506.pdfIn PDF document text
    • http://fazufunove.rf.gd/pufeda.pdfIn PDF document text
    • http://museduzapotu.epizy.com/falojuvuvaxa.pdfIn PDF document text
    • http://memegimowa.epizy.com/51018079815.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_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 5276 bytes
SHA-256: 4550f34d184c0eb56b9d04162d30c2af1d56839dbb6199f7ecdf4fe858bb8a94
font_01_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 11912 bytes
SHA-256: 90c17212baff27f0070743ed4fffd9280367cdc15ad33ceadde8b83606bc4669

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