Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a28a977bfdbd9f4…

MALICIOUS

PDF

78.0 KB Created: 2021-04-30 03:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12dc9257cbb9919d0e77e427eacf4f7d SHA-1: 2a3b35ffc9fb20ccfa9e3ba40295c3447d7938c9 SHA-256: 1a28a977bfdbd9f4866692502087ae3c60be1ddf084c97b6ff582e28354abe9f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=why+should+we+recycle+book PDF link annotation
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • http://ufenmac.com/on_my_way_pubg_videoika6w.pdfIn PDF document text
    • http://recepty-dd.info/yaari_song_avneet_kaur_pagalworld._comunh06.pdfIn PDF document text
    • http://vkrowl.com/806689450zxlka.pdfIn PDF document text
    • http://kefets.xyz/kriya_yoga_centre_in_jaipursv7p2.pdfIn PDF document text
    • http://pixelbarista.com/sodewivegamotozubazetqu9ty.pdfIn PDF document text
    • https://cdn.sqhk.co/vojeruzujuzi/L8Ujaif/identifying_sentence_fragments_answer_key.pdfIn PDF document text
    • http://chambrely.xyz/23211540098gvtbc.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/ggiegcq/ketijigokage.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
    • https://uploads.strikinglycdn.com/files/e968d1a5-9854-4258-a983-8291e1c79fc1/how_to_write_a_weekly_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93276b9b-376a-4129-8c1d-097a4b7467c1/depisebogeziro.pdfIn PDF document text
    • http://lewomunenuvi.myartsonline.com/bilumumezolaxo.pdfIn PDF document text
    • http://tasubad.rf.gd/import_document_into_word_2020.pdfIn PDF document text
    • http://girigiroret.rf.gd/dogidam.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 4876 bytes
SHA-256: faa0905bb49235789653c9bc6850fc36bdd0d441bd4bd9e23e03b168230cd446
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10720 bytes
SHA-256: 64edd5108211e9131d6e0dda50658ce6ae898f51a9ce320ad54656f7011d9584
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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