Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f49a1bd56454090…

MALICIOUS

PDF

81.5 KB Created: 2021-03-30 14:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffc8618249d971b16bc77879862841c8 SHA-1: 4441fa05d5e36c43eb222c9381667fc6186829e0 SHA-256: 1f49a1bd56454090d45121406e2db79d5e4075b8b8d8a64620cca5842d5242bb
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain related to online poker, which is likely the primary lure. The document body, though heavily obfuscated, contains keywords related to the URL, reinforcing the phishing pretext. No scripts were extracted, but the presence of embedded URIs and the overall classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • 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://dafemum.ru/wix?keyword=texas+holdem+unblocked+play+poker+online
    • https://cdn-cms.f-static.net/uploads/4414672/normal_602a836eb45fe.pdf
    • http://rejorevubirobu.sportsontheweb.net/34969464494.pdf
    • http://kokolonesafu.getenjoyment.net/kuladasowematulavu.pdf
    • http://viwavidif.getenjoyment.net/nufoguwexabogas.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_601eacf701a44.pdf
    • https://cdn-cms.f-static.net/uploads/4379355/normal_602cdb59b712e.pdf
    • http://tilosag.mypressonline.com/doa_barbara_romulo_gallegos_resumen_por_capitulos.pdf
    • http://mizizufiku.mywebcommunity.org/red_dead_redemption_2_guide_book_uk.pdf
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fde5376cc3de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vumovofun.onlinewebshop.net/86056632180.pdf
    • https://s3.amazonaws.com/visagogijulep/how_to_write_multiple_quotes_in_a_sentence.pdf
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_2e0364ceddd0429db02604a131d2c619.pdf?index=true
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_780ecf3ac98d4a9d80b8ec5a2a4cb146.pdf?index=true
    • http://wakafovoda.epizy.com/hunter_dps_build_neverwinter.pdf
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_a2625ee64c75478e92c6d83fcd30a4a9.pdf?index=true
    • http://tikupujixi.rf.gd/benegofesoxugelufa.pdf
    • http://dexadusoxeb.atwebpages.com/asnt_level_3_ut_study_guide.pdf
    • http://gipebevu.atwebpages.com/binary_numbers_calculations.pdf
    • https://s3.amazonaws.com/lebaxa/effects_of_unemployment_in_developing_countries.pdf
    • http://kadimadifunomox.rf.gd/gmat_official_guide_2019_quantitative_review.pdf
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_6ca0a404c26d4e248905fdb4b07dad45.pdf?index=true
    • https://s3.amazonaws.com/xubifupi/how_to_catch_lint_from_washing_machine.pdf
    • http://samesesodore.onlinewebshop.net/why_is_my_router_internet_light_red.pdf
    • http://fobiwuna.epizy.com/regugutes.pdf
    • https://s3.amazonaws.com/mudurixo/13927327094.pdf
    • http://musizaxodolof.epizy.com/vizijarexojalog.pdf
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_5c94801367794d8c9b8abb2d070adcc7.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_off000100e3.bin
08830bdc4ab21ea508bec5fdbc1110c584292860641b10c0d2fbe4a2d0a425e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 5636 bytes
font_01_sfnt_off000113e2.bin
1b17fcba8a8b64811c87bce1473915b3cf4d96ed0a1b4f9057b1d9f80ac120e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 10808 bytes

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