Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c24a0b5ae0a3b1d…

MALICIOUS

PDF

80.1 KB Created: 2021-02-21 19:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a0a100da81be942fb7a1a2b3a662d65d SHA-1: 7535fda00be5bf6255746753b75f42a2354cb7f7 SHA-256: 1c24a0b5ae0a3b1db92c2bf5afb628ef1e4b374723a3223c928621a58de3e5b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection attempt.

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://leonvi.ru/strik?utm_term=a+que+equivale+un+metro+por+segundo+al+cuadrado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376354/normal_60219d6b43932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414486/normal_600076a2a781e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6009d1c971464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_602f98a4d0bd8.pdfIn PDF document text
    • https://webenewosa.weebly.com/uploads/1/3/1/4/131409170/kowafu-rajujajosij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60121923f2ea0.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/rijikixubotowa_gafisina_fapagenuzedim.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/zuzoba_nibalaziminexo_juzamojut_sagep.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/kitakilesa/76556662946.pdfIn PDF document text
    • http://kupikobu.epizy.com/boccherini_minuet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/genusutu.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/physically_based_rendering_from_theory_to_implementation_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/rauf_faik_childhood_official_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/el_acuerdo_de_bretton_woods.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/xorodokukejon.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/gunesede.pdfIn PDF document text
    • http://fakeduzit.rf.gd/fraction_worksheets_year_7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 3196 bytes
SHA-256: 7c63ecc69363cab1dd50356bce79934f125fb1a455d3c3ef5b26a70abbd49d6e
font_01_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 5568 bytes
SHA-256: 3fde0de04e69626d40e39ae0e19b125bda124e8136af88901df86b2f9052538b
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 13000 bytes
SHA-256: 4f4c0eb48c29cfdbcaca62a34807a9be1869b8bf720dabdf53702cf624647ddb
font_03_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16076 bytes
SHA-256: 1ba36ee00377f5d70e03d11ae50515577800d4d826e7f157183c651e921ad7ff

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