Malicious PDF — malware analysis report

Static analysis result for SHA-256 26735cc5df3eb9cf…

MALICIOUS

PDF

86.4 KB Created: 2021-02-03 14:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf06fb595862f2d0eaa43e4d9924dcdb SHA-1: 728d261441b030c2ac83e782ec653bbe46b64d7d SHA-256: 26735cc5df3eb9cf30f5662c60f7266dbd441a8995666436c4130651c612c860
176 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a distribution point for further malicious content. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were extracted, the embedded URLs and the nature of the heuristics point towards a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/123?utm_term=wwe+mayhem+codes+not+used PDF link annotation
    • http://lizakoku.22web.org/bajumopijojamakitidobita.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/5de53b156ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390323/normal_600896c3760d1.pdfIn PDF document text
    • http://zotagur.22web.org/lizard_evolution_virtual_lab_answers_module_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5ff138e9beac2.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/eZyjEji/fire_truck_siren_sound_effects_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_60090263ce061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380403/normal_600578895fac5.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/Ygg0dg8/rawuzigikoxefinexebizob.pdfIn PDF document text
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/kovepipod.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/tejuvonixag/dunob.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/cressi_reaction_pro_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/bolej.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/bofolisasoxewebedidovejof.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 6872 bytes
SHA-256: 83c0ebbff9bb991cc93af282d813e07eff3498bf04ff53b0f9d0884f90a25908
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 5260 bytes
SHA-256: f11f2c9fab3c8a887260f5c3c3245bc5bd1ceeca42bd904a2ced0853d7516003
font_02_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 8372 bytes
SHA-256: 0bc16baa1c836f640921686057d7e2c84bb34840208f83776a10e61899eeab2e
font_03_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 11532 bytes
SHA-256: fbe91a83a885292ba882b798d585255ea75daf1ae5cb674ca2b4d8dd8d392b8a
font_04_sfnt_off00014473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14473 1740 bytes
SHA-256: 0fa38b11e28a8990e1b947714e894fba9dc87d533679748745bc540cfc52814c

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