Malicious PDF — malware analysis report

Static analysis result for SHA-256 6323953a3b7ba0dd…

MALICIOUS

PDF

72.1 KB Created: 2021-03-18 09:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8edccdefd1cdc0d52e37be580d6616ed SHA-1: e821bd6e4c752f5a977b48185c3735f9bb18a6dd SHA-256: 6323953a3b7ba0dd7abf82a055988435a316a6873bed365b9aa4c1cd54a774c3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a potential phishing or malware distribution vector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=how+to+cover+corian+countertops In PDF document text
    • http://nekidifuton.medianewsonline.com/how_to_use_a_7_function_digital_multimeter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fe1616b1e7d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_60342c51669c8.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/android_adb_driver_windows_10_64_bit.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/washington_football_team_logo_helmet.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/rakabarixenurevok.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/87525928808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwisi/tenagejazupelukabufaxojix.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/mamisutemukuronosifuxob.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/despacito_lyrics_ringtone.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/simple_arduino_projects_with_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/bcbs_of_minnesota_pharmacy_prior_authorization_form.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/8272412672.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/nokevi.pdfIn PDF document text
    • http://rowabereduxafu.epizy.com/pirates_revenge_arcade_game_manual.pdfIn PDF document text
    • http://javisan.epizy.com/nikezilimibesujokaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/82283875159.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_231aca9b01534ddc8b6f5807eac1c56b.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_79cee126058b496ca01a9fa92de1cd9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/hopes_and_dreams_roblox_piano_sheet.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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 5008 bytes
SHA-256: adcf21758b5d125e0ee13c0ada9d9dcec84fa173418bac5ed524d847989720a2
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10844 bytes
SHA-256: 307bd2774a8c16e878a4e100df4773476123615de5c7bb27b86f13c1b2b3f51f

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