Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4080610cd7649f…

MALICIOUS

PDF

68.9 KB Created: 2021-03-17 06:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7258f072a42f42700d64a1a6e563a2c1 SHA-1: ab8d7cd79c136c7b07671edc28287b420f453cd2 SHA-256: bf4080610cd7649fb1f12bdeb05abc8caae32c9dd13aabbd5d965308a7326472
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a service manual. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=emu+proteus+2000+service+manual PDF link annotation
    • http://zolepop.mypressonline.com/61051395539.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/words_that_start_with_omni_rootxnl6k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_60503fe4f3a9d.pdfIn PDF document text
    • http://ontrade.top/how_many_quarts_of_oil_does_a_ram_1500_hemi_take4cxjj.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/5540847.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/letter_a_worksheets_preschool.pdfIn PDF document text
    • http://ziposodepow.mywebcommunity.org/design_lab_ideas_for_physics_ib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fcb5dfc8b5de.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/fc1fd330d55.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/data_structures_and_algorithms_in_c_weiss.pdfIn PDF document text
    • https://sipizoreju.weebly.com/uploads/1/3/4/1/134131451/fovezobosebulopo.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/rawujozosakozelugex.pdfIn PDF document text
    • http://remontnatali.ru/what_is_the_best_app_for_watching_soccer1i1hl.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/kidde_smoke_alarm_-_long_life_sealed_battery.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/lumujuxurutugozusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/binance_desktop_app.pdfIn PDF document text
    • http://mukesijurifa.epizy.com/jemewojinekevi.pdfIn PDF document text
    • http://zuputes.atwebpages.com/rosario_a_la_preciosa_sangre_de_jesucristo_el_senor.pdfIn PDF document text
    • http://pakapenabu.atwebpages.com/how_do_you_factory_reset_kindle_fire_when_it_wont_turn_on.pdfIn PDF document text
    • http://jedasuzafofirif.epizy.com/how_to_understand_indian_stock_market_charts.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/bhairavar_slokam_in_tamil.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_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 5372 bytes
SHA-256: 649ea6117f8b933d52bdd69dbc0d7cbba4d84d1b8549d1b84c3aded72d7451f4
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 10716 bytes
SHA-256: b1259e1ebe48800659665a4704a484b4082888ee2677bacd3e04f71b4f9673b8

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