Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c6f2f0dbeda427…

MALICIOUS

PDF

89.1 KB Created: 2021-03-24 13:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ecfcb5001c07e497d05c9076aa937dae SHA-1: 7e463c5bd6803a521de4ea029ba67deb4358d3fe SHA-256: 73c6f2f0dbeda427838f5b42407de9b7abb26878a8499fe1ab33136beecaf1b9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to pricing, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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=a+cuanto+esta+el+metro+cuadrado+de+terreno+en+mexico PDF link annotation
    • http://esclub.info/what_inferential_statistics_to_usexbv7y.pdfIn PDF document text
    • https://zubowofele.weebly.com/uploads/1/3/4/3/134381568/damamopa.pdfIn PDF document text
    • http://voseboler.iblogger.org/josuzo.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/8bf3d0.pdfIn PDF document text
    • http://kovefubiwajulo.22web.org/96953163905.pdfIn PDF document text
    • http://kijalixozez.22web.org/97236295347.pdfIn PDF document text
    • http://hookup153.fun/format_of_report_writing_in_english_cbse3bzsu.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/jjjMghW/mosuxuxawelol.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/2Kjiqha/cut_your_grass_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/hir0DPJ/rainbow_meteorite_costa_rica.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/bjdjcmC/world_top_10_football_games_for_android.pdfIn PDF document text
    • http://zdorovienashevse.xyz/7481388208440k6g.pdfIn PDF document text
    • http://zowutelufuga.iblogger.org/karate_shotokan.pdfIn PDF document text
    • http://reliables.ru/94216330853h0l1q.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/gfGMveZ/bspt_thread_chart.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/nexenam.pdfIn PDF document text
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/4c01fe7.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/ijjdgfI/wukilinomoziverijexasup.pdfIn PDF document text
    • http://msertis.xyz/zedirujanegutikomjct2p.pdfIn PDF document text
    • http://luxusirozutifud.22web.org/50791410491.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/voxakajimogunim-vekipu-linoledogig.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/KyihicA/42077156336.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://dufupukisamu.epizy.com/8595273883.pdfIn PDF document text
    • http://pitovevewapa.epizy.com/52986794118.pdfIn PDF document text
    • http://zofunumuwade.rf.gd/jovumusoluzoguletadixi.pdfIn PDF document text
    • http://xemugapot.rf.gd/canadian_tourist_visa_application_form_for_bangladeshi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 5024 bytes
SHA-256: 00ac416e05041a19bfa3f16dcf99cc0f03e59f6c798e21f78ea4eef5ade44ba2
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 12200 bytes
SHA-256: 858987eaa00a0b7a75f04abfe293b1af1b6a11162005af261f93d4a0fa19d309
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00014597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14597 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f