Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25ecb3705868d14…

MALICIOUS

PDF

77.4 KB Created: 2021-04-05 09:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9790edcb06b076fffc073e92a1589cc SHA-1: 72036a9d7782fdaa02bf100760acdedeff2ae8af SHA-256: b25ecb3705868d14d2e8d599213b6663db96bcc7f3878d30065c3542fcb3a403
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 0.9991

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://gimoguvi.ru/wix?keyword=printable+resume+builder+worksheet PDF link annotation
    • http://jadebey-x.com/restaurant_operations_manager_job_duties6dkeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_604ee2c56201f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60629756d2a83.pdfIn PDF document text
    • http://badgesverified.com/zigirudibuwadumurenc5l8m.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/SxWib5h/11805223511.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/m4B1Ujb/republique_dominicaine_coronavirus.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/jU4ieja/zogovarurivuxoj.pdfIn PDF document text
    • http://help-copyrighteamservice.com/amazon_gutschein_kaufen_10_euro_dmalz5x.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/P5ibhg0/international_food_days_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/egeFwih/at_t_prepaid_phones_samsung.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_6058bb7149cff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5ff0d2383f786.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/1486366605uckdk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5ff02e1f1ba69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/number_system_and_binary_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72dcb03a-54d7-4d93-828c-ee8ce0150a22/casio_ctk_496_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243e0869-4337-457b-9a33-ee362a264b83/network_security_key_for_mobile_hotspot_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/rutizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e362c7-c197-4766-a273-41e2f3f966ee/sobalatafoxegun.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/gold_leaf_sheets_buy_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36931473-7b14-4426-a261-d8ec4610e685/92857339893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b1d634-3f96-48ec-afe0-786e19ac35e0/the_ugly_american_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eacc1c2-3c79-49ee-9056-20cb789431e0/obra_literaria_el_si_de_las_nias_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6f6c0d-2066-436c-af2d-08e0f2720fc2/what_is_international_trade_and_commerce.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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 5364 bytes
SHA-256: 17e43fd3e36b8ebc04f0d1b0df18bc31a6276b118e6e27f663e603acdfc81afb
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10756 bytes
SHA-256: 431e5d143ec45be925d438679b135fe4340a0ce50b5a8b5800d3e5545da879eb

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