Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3d018810d3ea98…

MALICIOUS

PDF

69.3 KB Created: 2021-04-06 13:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca222a9a7087cce2076df654cea31837 SHA-1: 6d0e8441ec169c9d7b650e562cd6503317069976 SHA-256: 6f3d018810d3ea98e96606ce5b71cb6d24a643b09abe9831816aab49bc947c43
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=linea+del+tiempo+de+la+computadora+prezi
    • https://cdn.sqhk.co/konumapedowe/j8uiau5/teddy_roosevelt_statue_defaced.pdf
    • https://cdn.sqhk.co/nadokikado/bijKkdM/sagajeloduzipife.pdf
    • https://cdn.sqhk.co/labifikup/Mp2jaha/dewukelazisakosajusa.pdf
    • http://de-bewertung-id-q2e5t23.top/star_trek_the_next_generation_cast_alexanderrcs6k.pdf
    • https://cdn.sqhk.co/xiruregexibe/hgFhfhi/deadly_car_accident_today_near_me.pdf
    • http://shop-onlinediscount.xyz/tipos_de_cristalizacinx7d8v.pdf
    • http://vijoviresole.mywebcommunity.org/jakimadozu.pdf
    • http://rajukilodagoje.mygamesonline.org/33090319993.pdf
    • http://rimka.xyz/billiard_game_free_setup4dry2.pdf
    • http://bazunujovi.scienceontheweb.net/computer_acronym_list.pdf
    • https://cdn.sqhk.co/fidinananale/nhdKaha/panezezubefagubalagogesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavotuvezomevi.myartsonline.com/inventario_de_estrategias_de_afrontamiento.pdf
    • https://s3.amazonaws.com/bipepezuwed/blame_it_on_the_boogie_sheet_music.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_f723e5fa3b0044adb42378d3571d1b27.pdf?index=true
    • https://s3.amazonaws.com/jolozidabi/vomiravorunexasezotapat.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_0b4e22bb790948058c58fd11f2c11544.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d294.bin
1840ded467eb79f0f59bcc1b38cecaf78bd9fa52087339e3750863c10dff54e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 5032 bytes
font_01_sfnt_off0000e3a5.bin
6ae7e2a222c49b58395832d4a9719598cab035f0bdaa15dda55769c978cd4601
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 11260 bytes