Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6a5dcdc5d878dd…

MALICIOUS

PDF

96.3 KB Created: 2021-03-10 11:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: df6fd1be5966ef8ac823dfc8c5be24c1 SHA-1: cb773a6e4418bf7aae5eff776518d2dd96abc4f2 SHA-256: 4c6a5dcdc5d878dd8827fcea998c60123245c66454a8f579087e3f1ea781706b
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a notable one pointing to 'nipisod.ru', suggesting a phishing or download lure. The document body, though heavily obfuscated, contains text that could be interpreted as a lure for a 'Europe tour guide map'. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a malicious intent to redirect the user to a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=europe+tour+guide+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461511/normal_602b43f4a4f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6016229634af6.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/31629189682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_603b5e61efe3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5ffc862c21ac4.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/18144358673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6033e2d99d510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_603ce4376ca34.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/shark_vacuum_and_carpet_cleaner_combo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_6001e709a5d5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/popilo/audible_audiobook_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27cff056-5d7c-4d2c-b662-1864ed15c1c7/vogowopibijisodutewiki.pdfIn PDF document text
    • http://pinukemedorurol.rf.gd/47493101430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bac407-3804-431c-9029-f9dfda2af8f7/ap_human_geography_unit_1_vocabulary_list.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/data_communication_and_networking_ppt_free_download.pdfIn PDF document text
    • http://tisajepi.epizy.com/calculus_8th_edition_early_transcendentals_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac82710-d21b-46b1-9359-0bff116d4d0c/is_the_stock_market_closed_on_new_years_eve_2019.pdfIn PDF document text
    • http://muferipimakolop.rf.gd/three_important_purposes_of_writing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88eb9219-f6d4-4ad9-a71a-92ece73cd841/gireb.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/informasi_daerah_bengkulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2387dd8-04f7-41bc-955e-1a063cb3a631/how_do_you_figure_out_body_surface_area.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/android_9_update_for_samsung_j8.pdfIn PDF document text
    • http://xasepeza.rf.gd/analogy_worksheet_for_2nd_graders.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 4104 bytes
SHA-256: 7ca6c421b66463e7cf9908623f2b9f56461f54334d84f8b7a94031fd4d864b96
font_01_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 5028 bytes
SHA-256: 25df0f97bf5dc3f51e9042a40c7892af8849987885dd3048086559135f0a02ef
font_02_sfnt_off00013e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4E 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_03_sfnt_off00014e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2D 10344 bytes
SHA-256: a1ac9ed7be2197e6099189b47768de39a7170678f20ec6c6c51f21724b123b6b

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