Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8f7de92e9493c6…

MALICIOUS

PDF

75.1 KB Created: 2021-03-22 01:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b471bc952fe874a8e92748cc5a824afa SHA-1: e9e7115bdc75ab8e91dde85522d589b9804b688e SHA-256: db8f7de92e9493c6364c732758d3db303ada1003560a5f9eff878860b59fbc7f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or spam document. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam tactic. The embedded URLs are likely intended to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/award?keyword=contrato+de+confidencialidad+ejemplo+pdf PDF link annotation
    • http://reduslim-shopofficial.site/80478186032vc1p9.pdfIn PDF document text
    • http://leafester.online/59229907814u6lg1.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/dnd_5e_editable_character_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/4gjMgcZ/border_patrol_academy_dates_2020.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/28054429815.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/urdu_to_bengali_dictionary_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/gcjbmhd/blue_bloods_cancelled_or_renewed.pdfIn PDF document text
    • http://mazers.fun/wijosakijuzugubewogiri2f57m.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/8155cab9-48e1-42f5-b8d1-19937ae4e58f/oracle_12c_client_software_download_for_linux.pdfIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_52deee28f4af44e8b9be0376c89ecd25.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_14d19f9f17654d8c9fcafe638a0bb942.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_4db68399c3dc4b739ca184cb68e39165.pdf?index=trueIn PDF document text
    • http://pozajuw.atwebpages.com/pressure_gauge_calibration_procedure_using_dead_weight_tester.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_a9320d7c0e0448dca4646293ae457994.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_b1ab6b3d30e145ba894e83b1bbe1b91f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1362b818-b996-475b-aaaf-426c8e716b66/62005440464.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_f607f998643146c9919155353010d17a.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_6fdbb4b6991d4e5cabf23525233d6b65.pdf?index=trueIn 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 5104 bytes
SHA-256: 729d44a6d10edd94deecdfa7760ac23c200491cf09dbf20a6fb9b527012785d6
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 11436 bytes
SHA-256: 6b0f97133cc496d7468efc9880a4aed7b7c54be21ae4ffcc4047ab828b5f4679

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