Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fadaea8a7551df…

MALICIOUS

PDF

74.8 KB Created: 2021-03-08 06:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ddb0cb12fad9ffc1f4b3525e161d9600 SHA-1: 1ae7f6f280beeb29a2bd407c939e8116b1210871 SHA-256: a9fadaea8a7551dfcc2681de89457ac17dae737106cec9f479f60e4fa658d977
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 hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/aws?utm_term=how+to+use+the+waring+pro+waffle+maker PDF link annotation
    • http://juwaniwabi.medianewsonline.com/how_to_connect_epson_xp-310_to_laptop.pdfIn PDF document text
    • http://my-favshoph.online/object_pronouns_worksheetevs32.pdfIn PDF document text
    • http://finansi-7.online/english_course_material_for_beginnershf4ld.pdfIn PDF document text
    • http://probmaka.tech/audit_report_of_tata_motors_2016-_17rcs4t.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/log_bar_table_and_chairs.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/how_to_use_mr_slim_remote_control.pdfIn PDF document text
    • http://all-casino.xyz/airbus_a330_seat_guide7fwoh.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/crear_diagrama_de_clases_online.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/butterball_oil_free_turkey_fryer_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gawusozuf.epizy.com/how_to_draw_anthro_heads.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/workday_company_information.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/what_should_i_do_in_lilycove_city_in_pokemon_emerald.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/40166246431.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/amazon_apple_ipad_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/tevijozifutu.pdfIn PDF document text
    • http://mubaviz.epizy.com/decimal_fraction_addition_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/pafomorolasuz.pdfIn PDF document text
    • http://jevusavisa.epizy.com/8803585683.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/mevelupagulosizabixapiba.pdfIn PDF document text
    • http://walefusariwe.epizy.com/spasticity_management_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 5316 bytes
SHA-256: bcf1139608456ece0842673572f07442fca9b3cd210aabdf681b800502fc6a4f
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10376 bytes
SHA-256: d33dd05e2b93c2e1166f270ba8a073faeea03e5673b7d81875d60c4bed53f6c6
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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