Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfd23b1c57e5871…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 09:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b17d92ade182b17e03d5b381ca4819a SHA-1: 89a388b38b7869b48379557d49aa4af17cc3189d SHA-256: 9dfd23b1c57e587104ff6935f2295c7bb9cefbe80fcb417361bfcd488e2649e4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm heuristic, suggests an attempt to redirect users to malicious websites. The document body, though heavily obfuscated, contains keywords related to recipes, which is a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=hyderabadi+biryani+recipe+pdf
    • http://student-yurist.ru/dell_optiplex_780_network_driver_windows_10jd6s9.pdf
    • http://tiktoktop.design/how_to_grow_lettuce_from_seed_step_by_step5cla0.pdf
    • http://collegegraduatecentraldating.com/komukupamomuwejuocy4l.pdf
    • http://mixonajoko.iblogger.org/pamixufedaf.pdf
    • http://poradoit2.site/2010_camaro_ss_supercharger_zl1ykt01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34191975-27e2-4ee6-a91b-1e7d363cb18c/best_meal_plan_for_weight_loss_and_muscle_gain.pdf
    • http://jasulogitese.rf.gd/download_oxford_english_arabic_dictionary.pdf
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_310e7de4ed7745e6aaba5e4438d94da0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6b09df1-fa25-44d8-b37f-5ea6a82393a3/is_engineering_management_a_good_degree.pdf
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_6b4830e8104643469043d813cb5fdb7d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8def4bb9-dca3-4749-8bdd-5d503f67feaf/what_do_the_symbols_on_omron_blood_pressure_mean.pdf
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_8908ef9712f6430db20afb22331a3b81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37ec0b4d-a781-4dcb-aa11-cc5d67d45fb9/graco_nautilus_3_in_1_booster_car_seat_manual.pdf
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_fe26e9b777d7439e9d955ba471f282f1.pdf?index=true
    • http://jadizugexagosor.rf.gd/57478563749.pdf
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_406b43f82773465593cb26be851b0a5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ab2bd44-2f81-4539-8ff8-b6c4c5a13069/mr_coffee_iced_tea_maker_3_qt.pdf
    • https://uploads.strikinglycdn.com/files/4afef7af-e5b7-4534-a778-be9912ee022b/what_organisational_structure.pdf
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_945e57744ef34b1690d959ab35d616a6.pdf?index=true
    • 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_off0000eeb3.bin
f3959cd6fccb3db28c003c877a48361b47dcaa31694bcbffaaa5de9304869ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5144 bytes
font_01_sfnt_off00010047.bin
8e0edf529bd380c418ce4ae4053a3f3bbb060f56db2cee162ca45d77cfa9d42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 11608 bytes

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