Malicious PDF — malware analysis report

Static analysis result for SHA-256 7870ba1d9842e248…

MALICIOUS

PDF

101.7 KB Created: 2021-04-03 09:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a6d0a7b29a05b92f874fe7abb4e5931d SHA-1: 18161f4ce1f69bcbfb4e4c8aae5a246872d05d0d SHA-256: 7870ba1d9842e2484c74a68ae5c659cc37706532d28c560682455d63f40fe1c5
186 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 0.9993

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://kuzutuzo.ru/wix?keyword=ddo+character+planner+2020 PDF link annotation
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/tezerezesu.pdfIn PDF document text
    • http://prognoz-football.club/circle_graph_worksheets_7th_gradeqh7od.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/4327031.pdfIn PDF document text
    • https://rejoxaratexudo.weebly.com/uploads/1/3/1/4/131453252/6546171.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/3b9d548.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/7195414.pdfIn PDF document text
    • http://homeolimp.com/besegabavajofoxadanxnqdx.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/lojafurivu-witaboledogasu-xafiliwamup-junozagexevex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fe629606a5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_6058d6f27e025.pdfIn PDF document text
    • http://allfreebets.ru/355501748723mhcp.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/kanujoziva_kafagizuwiti_dapozoru.pdfIn PDF document text
    • http://wersita.space/best_price_bose_wave_music_system_ivqlvwz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3f95e1-1e64-451a-afab-94a02e62a8bf/does_arbys_still_have_5_for_10_roast_beef_sandwiches.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/bunobowopelitafogapuxelit.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/lagu_bump_of_chicken_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6e1487-fcfb-4c94-950b-d4e24f3163ac/final_fantasy_15_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245f2669-0ae3-4379-8fd3-f048ca480e88/pharmacology_books_for_mbbs_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/85083185108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ae09a0-747e-4434-97fb-91e72506dba2/widadavesotokegop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24561c16-2e99-44db-8687-3443d83bf44a/does_usps_ship_to_japan.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/why_is_my_xfinity_modem_blinking_white.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_off00015289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15289 5256 bytes
SHA-256: 877a324902157aaf183f033604db35a5959f4b33e411d3b51558b7da69896e12
font_01_sfnt_off00016467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16467 10652 bytes
SHA-256: 5e2b3378ec3e614dab5a09fdc57fd51b6271255b8d9c4a78bc05fe35692e0811