Malicious PDF — malware analysis report

Static analysis result for SHA-256 0228058be560c370…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 00:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3bb1489f18b9cac659a2ce0048ac86a SHA-1: d64a9f011c14f68dbeace7c7265a0f034c61691f SHA-256: 0228058be560c3705cb9deabf591f1db0bb2cc80b9066a78b3524612d689f954
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for medical topics. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=neuroblastoma+fisiopatologia+pdf
    • https://cdn-cms.f-static.net/uploads/4404753/normal_601765103b088.pdf
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5ff8f6f5bd957.pdf
    • http://kanobukomovis.iblogger.org/linux_system_administrator_roles_and_responsibilities.pdf
    • https://static.s123-cdn-static.com/uploads/4448718/normal_600399abac20f.pdf
    • https://static.s123-cdn-static.com/uploads/4425506/normal_5ffe1a4e5d1b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11827d8f-61ed-4742-9fd4-d4cbccfaf594/89810599415.pdf
    • http://tekojexabutixas.epizy.com/beethoven_ode_to_joy_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/926b60bb-f89e-4129-a845-bbdc59168c2c/how_much_does_cyberpunk_2077_cost_on_ps4.pdf
    • https://uploads.strikinglycdn.com/files/88c3f0ab-30a8-41cc-ad6a-a6e486dc9ece/how_to_self_study_for_ap_physics_1.pdf
    • https://uploads.strikinglycdn.com/files/e443d4db-b7e9-4ebd-a885-69c0adc79793/hp_laserjet_p1102_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/37bf5d01-f6be-443b-ad32-7d6905fe2f2f/sat_subject_test_score.pdf
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_9c33a0e5b2a84c968b529529dd412ebc.pdf?index=true
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_d2d2a7ee8bcf4b148d486bf724e12753.pdf?index=true
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_870c0f25db9d4be0aec1c6dd55727150.pdf?index=true
    • http://joxufomuxofepa.rf.gd/88817609445.pdf
    • http://kazupisejurig.rf.gd/when_should_i_receive_my_ssa_1099.pdf
    • https://uploads.strikinglycdn.com/files/4283d2f2-f414-410d-93b0-a2071241244e/85879917913.pdf
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_8b79ee3efb014a51be2f5c71b22a3755.pdf?index=true
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_8fbe62129dbd40c38a542588d68b586f.pdf?index=true
    • http://vonanovab.epizy.com/don_t_look_back_in_anger_spartito_piano.pdf
    • https://uploads.strikinglycdn.com/files/79309bb2-c5ca-4c76-b6cc-4f4f2ff69f8c/73723137788.pdf
    • http://babokad.epizy.com/548182042.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85d.bin
03b3e5b45742c25f0b2aace354a278f5bea3dc6ed5b835b9a59ca237841af7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 5472 bytes
font_01_sfnt_off0000fae3.bin
47c6c716470395b84d5eec8248f1d050786957d0947ece780621dee478de50fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 11992 bytes

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