Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5adc8ac4f1de923…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 21:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c28b82baa43b38540df04c114112b404 SHA-1: 96cbaa214b36624d63400942536566aee27cff80 SHA-256: d5adc8ac4f1de9231b692181fe23f62cf1d2bc12514a2a02762d8eda2850e574
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jumiwimov.ru/wix?keyword=acid+base+neutralization+worksheet+pdf PDF link annotation
    • http://pugorot.mygamesonline.org/what_does_error_e_mean_on_my_honda_radio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_60250eecabd62.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/the_entertainer_tab_songsterr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_601580f06fc8c.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/zufaxepixiguxax/81951438661.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_0349e3c7d950432b93ffcd3ce7ba8395.pdf?index=trueIn PDF document text
    • http://zebigibozudival.epizy.com/47400458492.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_b9016caf0c1246f192302ef6518fb8e3.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_5b687f3c30744ae7844bb33a998a02e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/japanese_gastric_cancer_treatment_guidelines_2018.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_ad6897da7f0b491b8a5c35441d321dbd.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_48be3a13dbd44ad3955943b6d1df7c84.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_774e572f34cd48a9aede456779c8041c.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_1b7546821d02484791bc07f0e36feb25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/nurixifezapusapi.pdfIn PDF document text
    • http://simeririsus.rf.gd/kivafemixekejewikokag.pdfIn PDF document text
    • http://sesugemedolaf.rf.gd/nepudinowira.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/how_do_i_pair_my_plantronics_bluetooth_headset_to_my_cisco_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/degree_3rd_year_result_2019_marksheet.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_b22cb58b3adb4c378f0d99eec8971f39.pdf?index=trueIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/kw_to_amps_conversion_table.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_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 5576 bytes
SHA-256: a9afbd0eddf26a4af2257a7bed61363f7cf234d0fc92b0a0748171b0339a3303
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 10000 bytes
SHA-256: bf142d41af8556ff86d75262e0c8f3d29d1882a1c0e8d6ce641ece8290a01340

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