Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf6041f45ff578b…

MALICIOUS

PDF

85.2 KB Created: 2021-04-04 04:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d765f46ad6badf8e1bb8f2f3fc60c74c SHA-1: 506eeb4dd005f6b03f4887e9a8e17ebec4188737 SHA-256: bcf6041f45ff578b3665bd58827b31049a075915077e56f37b7c13013f8853ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jacksth.ru/award?keyword=inductive+deductive+reasoning+worksheet+pdf PDF link annotation
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/50a761aa9d51d4.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/tuzivabusadoxutize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5fd18a98f0e47.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/b750863923277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_6032b08a9932e.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/fogevojalo_lorepofinukijo.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/linajisele_sorexodoxir_lugazeli_bulorusixenipim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_5fd3119a20ec6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/gone_with_the_wind_remembered_museum_cleburne_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/boss_film_ke_gane_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/qualitative_water_test_for_coliform_contamination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c9956b-e52f-4f41-b645-1b79597aaa15/savopigibipoxowiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/endless_space_2_cravers_guide_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2cc6d57-6549-44fe-ba54-4d0f361047f6/fopuwixugadare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6a0cb2-a2d1-4668-9a71-2d4396bb6e81/pezubaroge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3adad26-2a9f-4b3d-9e05-e2c34f02135d/tubafamopijolofalozagitex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce05fe2a-ca41-48f6-9a86-ed38a6f65155/legal_courses_in_canada_for_indian_lawyers.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/jugaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/arabic_language_writing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/zipilawibudo.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/97757583297.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/rilewajusobiradab.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/brighthouse_life_insurance_policy_surrender_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/88503350804.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/27070297139.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 5420 bytes
SHA-256: 0ba94dae4691e1f68ef067a41dd226130e22b0f1375d0c423842d3970251b591
font_02_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 11236 bytes
SHA-256: d0b910af3f089c6177d2095922d6f202b4fe52162cef3ca28a88773bb9fabb19
font_03_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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