Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c3f372c7a7e877…

MALICIOUS

PDF

77.3 KB Created: 2021-04-05 01:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 9d9ba8f080d011aa2108a3cf6f9ca97b SHA-1: eb174619d97893f9385daabd584a5245368d2406 SHA-256: a1c3f372c7a7e877539f1e2b89ef1c9ff59f85ef3e31be7643df99ac2189b29e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the nature of the document as a deceptive redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=heritage+doll+school+project PDF link annotation
    • http://faxusupovetek.sportsontheweb.net/north_carolina_drivers_license_test_handbook.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/tikefom.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/wilomexulabesabebujoxe.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/skf_tapered_roller_bearings_catalogue.pdfIn PDF document text
    • http://tdsevsvet.ru/razulugovobidiqonc.pdfIn PDF document text
    • http://autolombardpro.ru/rifixitelk6eu7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_ba4c0c1997494515859a93f97bddc489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93981a6f-f518-4004-bd81-b1bf0cb734d8/samsung_s20_ultra_launch_date_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ac4bd3-6bc5-48cc-985c-fffd453a555b/sufuxepamiwigik.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_3069008900ef4012aaf183e7660a2e80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/674a0b26-d71a-45a1-b826-b92cc3529c60/2012_lexus_gx_460_for_sale_in_nigeria.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_17724b5d55cd46749734dbd01627bd64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c37d85-9a24-4176-8e34-695252bd3425/lasko_tower_heater_target.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_86c883cb47084b389b183416d3d7008e.pdf?index=trueIn PDF document text
    • https://aaa8450b-5959-4376-bf95-5e5e4b45aab3.filesusr.com/ugd/bcfc74_2f1425b7157946269d64f9bb7f1e3d74.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_4dca53a067294f69b01fedf5673e164e.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_405e39a8145b4fc4885d77631a231901.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0393810f-4cfb-4120-badb-c8c9ca48024f/genre_film_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffc7a65-daec-4254-9184-50a1867e316d/xudijo.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/google_sketchup_8_free_download_full_version_for_mac.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_10c3fe3602a0467e9f76262bc7e498eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bdd0a5-e8e5-4987-993e-7da3c262d7b4/sta_rite_pump_motor_troubleshooting.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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 5372 bytes
SHA-256: bf9f489c0807f9ba16711a8eb627c7bedbc71f28e667c56883d09cbe25d6b9b6
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 11160 bytes
SHA-256: 24f3a7de74e3ec81bbbff554634c21a22d287b0f026ce66dbc8e1b1c7d086fa2

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