Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75f4f36d201a9d6…

MALICIOUS

PDF

71.0 KB Created: 2021-03-06 06:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: efeb163bf1decba65f463a569977fa64 SHA-1: 6e6c6bfad820d63963e3ae421f708a93e6c38ac0 SHA-256: a75f4f36d201a9d6779f583a0a052263229ba16baded26e929d3629236b9bd68
186 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 SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on disposable domains, points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=forro+dance+sydney PDF link annotation
    • http://fashion-deals.xyz/matricom_g-box_q3_firmware_update07mn3.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/zjghfzB/wevojupebok.pdfIn PDF document text
    • http://interior.estate/paxazowibikupowawepb836.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/cgdXNwi/41326770407.pdfIn PDF document text
    • http://itslm.fun/riwaburokabegcg7.pdfIn PDF document text
    • https://cdn.sqhk.co/najuvotuwoz/jdOx6GN/fasateruxuvezeruxozuv.pdfIn PDF document text
    • http://aydym.club/steam_achievement_manager_vac_banrmzd3.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/iBjjgih/muvitof.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/j1jb4jh/tafuva.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/3jjTZ28/playstation_5_release_date_uk_pre_order.pdfIn PDF document text
    • http://wiinorama.space/what_is_the_moral_of_beauty_and_the_beastw3m39.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/sIGibFJ/jogatazaxotujesute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5de3bbf9-9bd1-497f-967f-9d3c3417b3f7/rt_vs_rt_plus.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_9f1ca060dbaa450896266d67aabfcf14.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_5eb0c33ebcfe4d99bc7a082d2d456745.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_b38fb1e8e71e4f168e43d7765b20fdd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f177292-a77c-4f5f-81fa-4b6be754e8da/82244213565.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/38385541682.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/essay_examples_for_middle_school_students.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_f26102cb59e64d62b10d8bdc683d3122.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/lalonuletopogagin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 4620 bytes
SHA-256: 6fe0ca7a2cc5ff66d9a127b317be56f7c9c514b0121182b041cbaca62ce53b43
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 9820 bytes
SHA-256: d586d4ec0fdab8def8bae932e5dc2d3e6bf2d7a4158203bda576ec2b331d9a9c
font_02_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333