Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfb88da3d0cb631…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 08:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cb4083a9e73b5d9922e22e4b66254354 SHA-1: b4cf38a117b9b477eb2959defee0de77029edb95 SHA-256: 4cfb88da3d0cb631b4233c6cd04648a23501a8b537d1bb4187e8b0720926760b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful sites.

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://bologen.ru/wix?keyword=kenmore+sewing+machine+model+385+manual+free PDF link annotation
    • http://xitabijasava.getenjoyment.net/42432379208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_6022bb1c829ca.pdfIn PDF document text
    • http://gogotmif.space/3d_comic_uninhibitedc7139.pdfIn PDF document text
    • http://limecash.xyz/vojejevetowuxanacgdmz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_60397316a5bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_604bc51705bab.pdfIn PDF document text
    • http://mmamba.ru/ge_water_softener_gxsh40v_reviews01y9e.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/zisogelivotinonedizep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fd796171adf3.pdfIn PDF document text
    • http://soul-felt.com/snustad_and_simmons_principles_of_genetics_7th_edition_free_downloadx9mjz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fe47281cb59c.pdfIn PDF document text
    • http://btsworld.org/full_body_functional_exercises_for_seniorst6cx4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_f119f8f358524c60a3b433140e9f8a4d.pdf?index=trueIn PDF document text
    • http://sojufuka.atwebpages.com/how_to_write_a_behaviour_care_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/pdf_book_reader_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/jejikaladi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f2cce4-e185-4fb2-bdb1-af1cd46ed79e/58653656103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f13cb02-2737-4cc7-a7a2-9f5f49c42ca8/what_solution_can_i_use_in_my_hoover_floormate.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/king_lear_summary_in_hindi_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6823727-a484-4d0a-b30e-f2a950c02004/85193937054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07923870-c2e4-4d3a-97fd-3027dc30346e/83340651307.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_f074c9a8dd3942b784dc0341050dd813.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_71d3d1059af24cf9bdf2f2b3e22e3896.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/poganoguvoxol.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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 5980 bytes
SHA-256: 4c03a9ef4378f022bc40e8b696ad3fbf753aa3980bcb64bf84747359dfa955c8
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 10584 bytes
SHA-256: de5ba25456cf48f1a7ec129c69e11597de90b94111f51235f8d1cd04f1354b9e