Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f390c352d892c2c…

MALICIOUS

PDF

76.8 KB Created: 2021-03-20 18:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 76bef7f62fce7337ef16074025d4e173 SHA-1: 56d2a8c1e703ec327a1f51041f32f1ddaa8daa4e SHA-256: 4f390c352d892c2c5ab5fa73f8f0eaa038ae7d99223c3cb90da6cbe8c75b84a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9988

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://vilenefex.ru/award?keyword=articles+exercises+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370547/normal_6053ae2896470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_6040c07055fab.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/how_to_charge_ion_sport_speaker.pdfIn PDF document text
    • http://tiwirulesu.iblogger.org/sp_racing_f3_v1_sbus.pdfIn PDF document text
    • http://ganirutejiz.iblogger.org/apollo_twin_duo_usb_driver.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/what_are_the_advantages_of_a_database_management_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_605432fd52242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_6030d799a1837.pdfIn PDF document text
    • http://muzoc.xyz/10301617046nc4v6.pdfIn PDF document text
    • http://arendagg.xyz/sunny_wings_of_fire_wiki_fandomx7i4n.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/sunagililixafuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_600c93eae6221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_6036f74a98d26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_604f3b423212b.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/lupazudumatenud.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/academic_writing_sample_essay.pdfIn PDF document text
    • http://fastcreditcheck.info/download_chin_tranh_v_ha_bnh1peta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_6010cb8ad2c9e.pdfIn PDF document text
    • http://qunit.space/lekikojidojoneritenozin9gpff.pdfIn PDF document text
    • http://gatorama.site/zuxarusofagalajonikb0dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_60226960358c3.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/wamatasamegu/9419253865.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/87388772229.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/38744398710.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 5088 bytes
SHA-256: 846f03e49788b19fee9ad45043749b1cb5dda9ad856609e59bd5ab8c2b215e2c
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 11232 bytes
SHA-256: 241732cd252a81f148428008a6373887cceea254898f82e9d2715f1005239cda
font_02_sfnt_off000115a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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