Malicious PDF — malware analysis report

Static analysis result for SHA-256 2904ad5d71a8f972…

MALICIOUS

PDF

69.7 KB Created: 2021-03-10 23:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3832699d612f7594410c95a7bb8d3334 SHA-1: 90ab58180695159fce41ccfcddccda41ef9b2cc9 SHA-256: 2904ad5d71a8f97262c7b519589155a6397d2024d38c0ece397a7e29403af36e
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 0.9998

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://resalured.ru/award?keyword=demande+allocation+logement+caf+pdf PDF link annotation
    • http://repair-kvadrokopterov.ru/alaska_drivers_license_number_lookup_online31hzg.pdfIn PDF document text
    • http://antonioit.space/343438273525tx59.pdfIn PDF document text
    • http://liketime.fun/video_bts_dna_mp4_planetlaguj4osr.pdfIn PDF document text
    • http://mnatural.space/how_to_get_my_act_workkeys_scores4u53b.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/what_city_is_babylon_today.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/9619782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489441/normal_600477897ce00.pdfIn PDF document text
    • http://busibear.com/78157969497a6p0n.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/jufoxetomoruf.pdfIn PDF document text
    • http://gutprod.xyz/luxiwidakewnu59o.pdfIn PDF document text
    • http://rent-nout.site/import_excel_spreadsheet_into_access_reportsmct8.pdfIn PDF document text
    • http://okstore.info/purelusuwujawuluda0r7ek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_601aaa92a1455.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/is_the_sat_black_book_good.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/fe3f46600b0d.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/noxexola-biwujegazojojob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_d3508a30b93f4ed58fdb840fc0a5565b.pdf?index=trueIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_a186315ea4cc4325b415daabd1e9c773.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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 5200 bytes
SHA-256: ba20a0bf3719fd05bf0187f58c02939fd968f1e1c302ce2c809a4eb926bb8e24
font_01_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 9708 bytes
SHA-256: 5db9527d1270e11b55abddc9b813b2445badb1801c29a04a0baa1f88619219fd

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