Malicious PDF — malware analysis report

Static analysis result for SHA-256 e356b5309f22df9c…

MALICIOUS

PDF

66.6 KB Created: 2021-02-20 08:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3a5c6d3178b642ad09d04a87d056d1f1 SHA-1: fa0a25d302b79a1c04d836ec70d0810f25db1235 SHA-256: e356b5309f22df9cc4dbe05113eca8e53aa1b18014c6e89bf7f1d825404eecbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with several hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=i+am+david+clydesdale+pdf PDF link annotation
    • http://getdouche.xyz/890203628785ovps.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/4WG0SA8/2748164774.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/h7fZofQ/plants_vs_zombies_hack_free_download_for_android.pdfIn PDF document text
    • http://9gusevshop.website/webinar_autocad_civil_3d_2019_download9qy0h.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/b4ihyky/depogibozusaga.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/bDhjidH/agar._io_party_servers_with_bots.pdfIn PDF document text
    • http://ryukzak.digital/banjo_movie_song_bestwapjf04a.pdfIn PDF document text
    • http://chambrehub.xyz/where_can_i_watch_twilight_for_free_2020pqp6v.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/3gjVDgi/77058187763.pdfIn PDF document text
    • http://bellissimo.online/dermeval_saviani_livrosypco9.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/questes_de_analise_combinatoria_resolvidasvnaeu.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/vavale/voice_activated_teleprompter_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/xijetumitonafotijam.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/nordictrack_c2255_treadmill_specifications.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 5304 bytes
SHA-256: 5130eaaaf81ce2ce5e4b2f45fe511f9d6575667ffce09f6f50665cf45218dae9
font_01_sfnt_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 10504 bytes
SHA-256: 6a6066f71f1aa053b6d9915a92f818c12513dfb0601cadbd2066262f9fd43165

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