Malicious PDF — malware analysis report

Static analysis result for SHA-256 1807045fe76c9fb6…

MALICIOUS

PDF

67.9 KB Created: 2021-02-14 09:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed3ae78ab22f98cc63428bca6cf24925 SHA-1: 4ba1ae9ed3d1fab75367b5ec81830d1399a0318b SHA-256: 1807045fe76c9fb6f65da5dec2d500b998b29267c39220082623ab96e8e39cb5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Adobe illustrator brochure templates' and 'wkhtmltopdf', likely a pretext to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=adobe+illustrator+brochure+templates PDF link annotation
    • http://stat-index-co.com/virtual_table_tennis_android_oyun_clubcxjc3.pdfIn PDF document text
    • http://deemonatrafik.xyz/jujusefunazivojmcc73.pdfIn PDF document text
    • http://guitar.su/wiwimagewikebowalisajasnw8be.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/gdgfKgh/divavusezifunavegumo.pdfIn PDF document text
    • http://prizinsta.site/dajusalelatjdc4.pdfIn PDF document text
    • http://plusstore.pro/color_by_numbers_carspq76a.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/jjdfHgc/game_launcher_samsung_pet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fe980b50b6fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_6007a483095a2.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/2308651.pdfIn PDF document text
    • http://uspeh.icu/enzyme_kinetics_tyrosinase_lab_report8mupr.pdfIn PDF document text
    • https://fabodafulunulof.weebly.com/uploads/1/3/4/3/134372089/42196d65351b0f7.pdfIn PDF document text
    • http://net-klientov.ru/corel_draw_12_guidekijnv.pdfIn PDF document text
    • http://rusherx.studio/english_grammar_course_book5s3p5.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/a2u0mZu/mobile_strike_cheats_that_actually_work.pdfIn PDF document text
    • http://maykistore.ru/joplin_tornado_damage_2011gj64e.pdfIn PDF document text
    • http://pubguckazan.com/gokobewuj9jqf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 5444 bytes
SHA-256: 8f23430448a1679f4ff3f6d2e2bd0ae8923c8fa02d3a04536b096f9a53509134
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 10252 bytes
SHA-256: e7bc3af76c021d2e6318731568fd98f85337ef6ccc07605a97c268c132ec2dda

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