Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b4b0307db89cf…

MALICIOUS

PDF

81.9 KB Created: 2021-03-11 20:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c85a24c0a5f7bfc89118a42b626879 SHA-1: 2b714c1a0c7dbfc3a7a878f0467ddb6b5472c36b SHA-256: 019b4b0307db89cffda0bc43d210dfb954112565825df57da9c66a13954abf82
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, indicating a phishing or scam attempt. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely to deliver malware or facilitate scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=bluestacks+apk+free++for+windows+8
    • https://cdn.sqhk.co/rilowikapaz/FjfbZ5C/13456925633.pdf
    • http://diguwejilevaz.22web.org/writings_on_the_wall_piano.pdf
    • https://cdn.sqhk.co/kipezipilojo/djdtb24/mla_format_works_cited_8th_edition_example.pdf
    • http://binadof.iblogger.org/39382119574.pdf
    • https://cdn.sqhk.co/podiwilur/fjjqfjb/merriam_webster_dictionary_premium_latest_apk.pdf
    • https://cdn.sqhk.co/pelopuxi/icghSVp/zugofevat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_aae398233a5f4a3096bd4bfe853ddd28.pdf?index=true
    • http://parubixus.rf.gd/85139494906.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_840adadb2dd943939b0d6beb48a38961.pdf?index=true
    • https://s3.amazonaws.com/joterige/bipanafafitowowememanafeb.pdf
    • https://s3.amazonaws.com/lomogas/xaduvedugurupil.pdf
    • https://uploads.strikinglycdn.com/files/7357306e-dc16-4324-ac13-fa8f37eb94fd/garmin_vivofit_4_fitness_tracker_manual.pdf
    • https://uploads.strikinglycdn.com/files/9f052b81-8326-4854-a5ec-0461e6c41290/paduzuwogajav.pdf
    • https://s3.amazonaws.com/petubapizo/raxalokovugixufevutijowoz.pdf
    • https://s3.amazonaws.com/rovikibixu/35455916028.pdf
    • https://s3.amazonaws.com/devuxuzejozam/jugs_pitching_machine_owners_manual.pdf
    • http://xuvotawelotito.epizy.com/newelujimerudekama.pdf
    • https://s3.amazonaws.com/sefiwegegagu/lofutizolasitupan.pdf
    • https://uploads.strikinglycdn.com/files/fdb65120-02bf-4e8e-a5ff-d4a7e44f40a3/relop.pdf
    • https://s3.amazonaws.com/jijari/45744624548.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_48d07e7c2732430a884c958a66f397fa.pdf?index=true
    • https://s3.amazonaws.com/pewibim/business_law_books_free.pdf
    • https://uploads.strikinglycdn.com/files/b38b5737-1d57-4e1f-8a18-86701a727aaf/dressage_intro_test_a_2020.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_0b18f2e6910042d1ba66d26379d16104.pdf?index=true
    • 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_off0001025e.bin
7c87410a2815f99d64e171725d792f88d46d567651004abfa85084e796b8cbd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 5548 bytes
font_01_sfnt_off0001156a.bin
7793f1fcdbce818b6986003982284c82d3b93ca0b0974e5df13bd0ff219bbb30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 10784 bytes

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