Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec43e722e76da98c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-23 01:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ba43e07361b1c982a0692d297b688602 SHA-1: d386d80e15af2535e511c3a48715850e821fd498 SHA-256: ec43e722e76da98cfee81d75b8f596fd498aa595268dfba3c97764ad1aa826b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary URL pointing to a suspicious domain that appears to be a link farm for SEO purposes. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as a phishing trojan. The embedded document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links suggests an attempt to redirect the user to a malicious site for further exploitation.

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 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.
  • 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://seumenha.ru/award?keyword=spectra+of+atoms+and+molecules+pdf PDF link annotation
    • https://najoduvojubowi.weebly.com/uploads/1/3/2/8/132815002/ef5980343ff8.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/gumevozamupavisixuwa.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/sowoj.pdfIn PDF document text
    • https://dasomuduse.weebly.com/uploads/1/3/6/0/136095852/dopakujosilori.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/repijewewobarelu.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/shadow_runner_eso.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/tojotekuxawudigilaxi.pdfIn PDF document text
    • https://tekitoloveda.weebly.com/uploads/1/3/1/0/131070611/3699870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/26258515408.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/reading_ielts_passage_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/super_phone_cleaner_app_apk.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_06a2f6d22ee14962a9be33d77d70b4b4.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_51018183da2c464590b39f98122366ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf16c4ff-bf5c-4b1e-b622-dbd87f996469/ti_nspire_cas_software_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd9ec98-b779-40ae-8eb4-db2411448f14/woluw.pdfIn PDF document text
    • https://77a56ed3-7819-4444-81ac-e5309e2b8da7.filesusr.com/ugd/bcd086_fa830859996d4f88b5edeaf0c8191b73.pdf?index=trueIn PDF document text
    • http://jadukubilelib.myartsonline.com/online_to_autocad_dwg_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c29bfd-097c-41ed-a2b2-76d8473b70b1/64225845618.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/miguel_adorn_music.pdfIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_d18817c8dedf4b70abab2cb9ffb77210.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_b255d4970c46452197bff9cf9cd0c22c.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_230558efd3dd4af79c3ce700a0c8e98d.pdf?index=trueIn 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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 5404 bytes
SHA-256: 411658bdaf87215e30a0949cea5b1bbc16e48f85011cd47f2878114826313081
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 10532 bytes
SHA-256: c1c520551b8a7ceb52dc7b96f0a658357e1a1949fc3729a591cdcfaa24141858

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