Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee23ea23fc39735d…

MALICIOUS

PDF

76.2 KB Created: 2021-05-16 23:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004d8387f8fb95b1027dfdb2467bbef0 SHA-1: 5a028e3eaee3f7f76358f761cf3928fccaa4bb16 SHA-256: ee23ea23fc39735d0fde9935678172fe5cb49e6a54e813ee982b7cee6f56fe20
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Sig sauer sp2022 review youtube', which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=sig+sauer+sp2022+review+youtube
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5fe97e283a83e.pdf
    • https://cdn-cms.f-static.net/uploads/4419195/normal_600b20e24f3af.pdf
    • http://yudekor.ru/drum_kit_for_sale_olxogef1.pdf
    • https://cdn-cms.f-static.net/uploads/4406789/normal_603fd9986767d.pdf
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/sonixo.pdf
    • http://copytoshka.ru/y4mr5.pdf
    • http://wiinorama.fun/zombie_shooting_survival_haunted_town_games_mod_apk9hf4p.pdf
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/56ac30506b8eb09.pdf
    • https://xazupuve.weebly.com/uploads/1/3/4/8/134863790/394dd9349111a.pdf
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/xetegigoxa_zokukigolilojo.pdf
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/mutuzepar.pdf
    • http://vbruti.site/among_us_wallpapers_for_chromebook8i9cu.pdf
    • http://boldly-grow.com/28419666650fht9x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nazowovemozugiv.myartsonline.com/13041483986.pdf
    • https://s3.amazonaws.com/neviwove/acrobat_reader_for_free_software.pdf
    • http://vugugemo.atwebpages.com/4999445340.pdf
    • http://bopisumeku.atwebpages.com/pdfmake_angularjs_images.pdf
    • http://gumomexad.onlinewebshop.net/the_art_of_eating_spaghetti_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/0e788d3e-4f4c-4858-b2a4-4bcb313fe13e/dewalt_pressure_washer_operation.pdf
    • https://uploads.strikinglycdn.com/files/cca396af-9072-4a99-94f4-72c470d4fb2e/ruwekezulokasava.pdf
    • https://uploads.strikinglycdn.com/files/0d44ce86-7b5f-4744-ab07-2d6397c968ac/98064273063.pdf
    • https://s3.amazonaws.com/pafiganovavi/lg_v20_charging_battery.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_off0000e5fb.bin
4328ef6857537ae183872807647e60d7cf5e6ce03fce1267881ca3dd7b8e2ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5724 bytes
font_01_sfnt_off0000f99c.bin
70d0071de19ea9cde8e6407950009e832cd47469c5c14f332d301a56899ea315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 12908 bytes

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