Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2c58fbde1739c9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 18:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d27fd3ce00feeeef3d9a1513e9d38f7a SHA-1: 921e9514383f563e26601764335ca1386b76b343 SHA-256: 5e2c58fbde1739c950a73ef723dd5018f4a8e1aa9bdc6d269113dc56d934850e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. One of the embedded URLs, https://jumiwimov.ru/strik?utm_term=python+pocket+reference+6th+edition+pdf, is presented as a reference to a technical book, likely as a lure to encourage users to click and download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://jumiwimov.ru/strik?utm_term=python+pocket+reference+6th+edition+pdf PDF link annotation
    • http://help-lnstagramcopyrights-verify.com/8102728567ccc0x.pdfIn PDF document text
    • http://dronextactical.xyz/83612901521pf3qb.pdfIn PDF document text
    • http://redit.fun/pogil_activities_for_high_school_biology_answer_key_scientific_inquiry0u9ms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_fee3a482d5ed4a259bada31205e92242.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_4a57ac3b7dd74aac8ac38a2beaff2535.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_4a41083151104524a856b5fbfcd51f5e.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_e20c5fa4981c49d399773ea1dde1e950.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8570e243-eedf-4d08-b370-9b083ea92652/luzakukeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf689ac-28d2-48d3-a92a-b40158be8f61/wikotanabevovuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627c50f6-9b5c-45ca-b1b6-22f9c6b012fe/aprender_ingles_con_canciones_subtituladas_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbd9ecf-512f-4475-a0e2-e9b63ca36410/penakinelozijoli.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_84de03223af246c490b53c6392234f37.pdf?index=trueIn PDF document text
    • http://jisizulo.rf.gd/69732937734.pdfIn PDF document text
    • http://jufebiwewizeza.rf.gd/mokopozo.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_e7bc787011714a118b3a555d1e984c6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca934259-a08e-4a03-8f57-72496a24672d/diy_gun_cleaning_table.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_4acd0b76e7764994a8e41dc6fb85d0a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec65662-1603-4fa9-9f8d-b320115369a9/can_zip_codes_be_4_digits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f35661b-f7eb-4c74-ae89-0b230ef5cd87/first_alert_carbon_monoxide_date.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_802a02770d904decb8175d1b59836a07.pdf?index=trueIn 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_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 5144 bytes
SHA-256: b615a0c705f1c393d753ac0482cd4a1e5f1174bc1b6b675f8552a1d3b5a6c22d
font_01_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 10828 bytes
SHA-256: ea05a127f8649045f8120b59eed117c6a2be959b818bb1a00ef680b5a3bcc0e1