Malicious PDF — malware analysis report

Static analysis result for SHA-256 77768f713363329a…

MALICIOUS

PDF

73.1 KB Created: 2021-02-22 05:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2671aae3dd9dd9a27d0750a7a16279b SHA-1: 45cc2132a90f714bdb34361ebe41f5644c73297b SHA-256: 77768f713363329a74bde9664d31e095fd5feb4c690924553a0342ab0695ccee
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 machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain search terms related to appliance troubleshooting, which could be used to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+reset+cuisinart+bread+machine PDF link annotation
    • https://cdn.sqhk.co/winelolibug/cjeihcV/awesome_army_desktop_backgrounds.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/hYAh0jf/fubuvutoda.pdfIn PDF document text
    • http://ighelperscenter.com/what_channel_is_vh1_on_fioslh8rk.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/gijjha2/free_online_photo_collage_maker_for_facebook.pdfIn PDF document text
    • http://jobauthor.online/software_project_budget_proposal_templatevo8yb.pdfIn PDF document text
    • http://esmoney.site/tubigokoletozuxawoxuti8ngps.pdfIn PDF document text
    • http://onlajn-kassa.ru/fotarezukesikizowfdya2.pdfIn PDF document text
    • http://temppicture.xyz/15989368679kdf1z.pdfIn PDF document text
    • http://thecet.xyz/sivifizati3ck87.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/texafi-mewiwawiriva-renapewovuzexoj.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/fajepu_nujavivo_bobudano.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/haiihiE/37061536836.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/9817784.pdfIn PDF document text
    • http://bas-vorota.ru/dimevuam4y0.pdfIn PDF document text
    • http://sarkife.site/trenches_definition_business9cnj3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482858/normal_5fcc1ee3cb232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefuziboveteg.epizy.com/doddinghurst_primary_school_ofsted_report.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/cursive_letters_fonts_free.pdfIn PDF document text
    • http://fugijinamum.epizy.com/jutizul.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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 5340 bytes
SHA-256: 5540d5a3b2ebf2df7dd0792482482f7e76cd6a3962accfdd9400e08afb41c99c
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10332 bytes
SHA-256: e8b041a5e327a925c1198772411625f95789327af605c65478153bf33b242b06

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