Malicious PDF — malware analysis report

Static analysis result for SHA-256 1821d6598650d2ea…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 11:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e39322a26902fb73d65556d0dc32c006 SHA-1: 6279a9ab969155d19e91771c1cf1172d7d1c97df SHA-256: 1821d6598650d2ea58de0179bc1bba96e608616b3477f0eceb6e2f9ec531717a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

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 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://jottigo.ru/award?keyword=azeotropic+mixture+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444358/normal_60473bdb5dda6.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/56966db5ed092.pdfIn PDF document text
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/5d910c8b1e62490.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/rigagikexenapu_rakepikesan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_601b37da86eb8.pdfIn PDF document text
    • http://ragixanomus.iblogger.org/dvdvilla_bollywood_movie_free.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/nedup_barex.pdfIn PDF document text
    • http://wadixokup.22web.org/banjo_trance_music_free.pdfIn PDF document text
    • https://lowinuviposawip.weebly.com/uploads/1/3/4/6/134667304/wotizitobepuje-retewibeko-fifoliji-wobakurija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_600387342801b.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://s3.amazonaws.com/pisedij/4733686319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9c6d0d-6557-41c6-a36f-7adb4e8a663f/american_society_for_aesthetic_plastic_surgery_2020.pdfIn PDF document text
    • http://bokakemipik.epizy.com/nims_is-_200._c_answers.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_d1d5da9df34e42ac8813c2a980c13426.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac63cd2-bb8f-43e9-9d73-cd6ed99877ee/77713513059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6ddb3c-67b3-4d34-b668-37f35c0c48eb/15691305970.pdfIn PDF document text
    • https://274e0329-8a83-4376-85d1-fe7e07dbc583.filesusr.com/ugd/a86d68_28e2013465664d67ae05ff37ad60d152.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be86666-39c1-4c7d-acf5-709fe6535d38/45473840070.pdfIn PDF document text
    • http://gipanigiwulaj.epizy.com/show_two_excel_sheets_side_by_side.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/fagiwagawupegasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128393d6-0f12-4d2e-ab30-d2fd6f1a9530/is_snapper_out_of_business.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/croup_score_guideline_thai.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/best_vegetarian_recipes_to_lose_weight_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/pottermore_ilvermorny_answers.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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 4764 bytes
SHA-256: 0b2492b6d8422eeae034590dd216500f327f8c989687528837026b0357149f6a
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10420 bytes
SHA-256: d09c4f7b596fef3277e656a60856594b4afa4afa4a8c7236828632b8c477f27e
font_02_sfnt_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f