Malicious PDF — malware analysis report

Static analysis result for SHA-256 088525af2c92f379…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 00:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 20dd47e23a5a5c99377b8ef0b0bcd1ec SHA-1: 3b7451f388f325bcaa18d7a435ee2e9a955807c3 SHA-256: 088525af2c92f379681ada5aa4b812f448c9c4e1b72099309e3d634156f06480
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=how+to+wrap+christmas+gifts+step+by+step PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495858/normal_60085da3a88f7.pdfIn PDF document text
    • http://poradoit1.site/brother_printer_mfc_295cn_clean_unable_46xo81s.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/el_proceso_de_la_investigacion_cientifica_mario_tamayo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_604b080286b5f.pdfIn PDF document text
    • http://fiwetud.scienceontheweb.net/biogeography_download.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/kojoxefaparewurifik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_6032f0cb17b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/Cz4lKgi/radio_shack_soldering_gun_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/jfifRig/secret_escapes_hollywood.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/basic_acoustic_guitar_chords_chart.pdfIn PDF document text
    • http://ridunculus.com/97328304137nrhoa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_601f8612cb34e.pdfIn PDF document text
    • http://storezone.info/how_many_times_to_workout_to_see_resultsu73se.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/jinabom/gentleman_s_guide_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/abrahaminte_santhathikal_mulla_poovithalo_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/advance_directive_template_california.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_92e445128055400ab1e652ae67589da1.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_3f8d7d54902e492a8314f8a951c08fe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/python_list_to_string_with_brackets.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/who_are_the_stakeholders_in_public_relations.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5692 bytes
SHA-256: b28edba3ed5e22a15d92c8bd1f74381012e04893253d3df9093d8b0ab3cb1e5b
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10416 bytes
SHA-256: 46814a8f7194b412a96bfa7d22ab471874478e22ce0e5faf2628f6261d2be71c