Malicious PDF — malware analysis report

Static analysis result for SHA-256 0623fc729ad7dfa4…

MALICIOUS

PDF

68.9 KB Created: 2021-03-23 22:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97ae073b873df317d3fa6716cd80bc1d SHA-1: 207334eb98f91e7f1020f55be0863ca9cd461fb1 SHA-256: 0623fc729ad7dfa41dcb0ea5f0769120740095a46711d0ab79a800418767179d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content or software downloads. The document body, though heavily obfuscated, contains references to 'apk old version' and software-related terms, reinforcing the lure of downloading software.

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://lozipotod.ru/123?utm_term=windscribe+apk+old+version
    • https://cdn.sqhk.co/wibezudak/bBPiihh/61647507032.pdf
    • http://swiss-gear.shop/27103366186a3ucc.pdf
    • http://cybety.xyz/union_budget_2019-20_download_upscoxdao.pdf
    • http://suvarelis.22web.org/businessman_3_full_hd_movie.pdf
    • https://cdn.sqhk.co/xejadukoxeta/jcC7jbQ/misebusivebufizuwu.pdf
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5fcb8d74b7647.pdf
    • https://cdn-cms.f-static.net/uploads/4478383/normal_6049970fd2921.pdf
    • http://esmoney.site/tolaxovbuhpx.pdf
    • https://cdn.sqhk.co/takivelalam/jiFic4g/chat_rooms_free_for_singles.pdf
    • https://cdn.sqhk.co/fuxilumevo/i2Bvp1M/vejepolasetifosuno.pdf
    • https://cdn-cms.f-static.net/uploads/4369783/normal_60550f71b9363.pdf
    • http://verifiedbadges-form.com/what_are_good_video_games_for_11_year_oldsqvp2b.pdf
    • https://cdn-cms.f-static.net/uploads/4506170/normal_60421dbc78098.pdf
    • https://cdn.sqhk.co/boxokozofe/i6heshg/dragon_drill_terraria.pdf
    • http://andyhongdigital.com/xekatulunekuvozdmd4n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gogozibopuxut.epizy.com/vilibeverupewewuredi.pdf
    • https://s3.amazonaws.com/dagasopones/58381824316.pdf
    • http://jinimivunom.epizy.com/is_mendeley_better_than_zotero.pdf
    • https://s3.amazonaws.com/napejaxosinages/1589814918.pdf
    • https://s3.amazonaws.com/zifozujiwi/the_rules_of_magic_series.pdf
    • https://s3.amazonaws.com/jasadavebaga/how_to_create_a_fillable_form_in_word_2016.pdf
    • http://zarixisulepu.rf.gd/msi_760gm-p23_fx_cpu_support_list.pdf
    • https://s3.amazonaws.com/zetituri/62158830070.pdf
    • http://zudovufakigib.epizy.com/in_person_real_estate_courses_near_me.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a1.bin
1856e17ff10cd94337915889ffe565c4989b6b628fb53c7617bb0bf3e8e766bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 5344 bytes
font_01_sfnt_off0000e2ed.bin
346128d0c25ec31adfb9bc2a52b880bf1c78068010aa289f1195f0afc12f6220		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10208 bytes

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