Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9581110cc0df8b…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 22:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 21d759d03ae2e64143ec38fb84b2fb28 SHA-1: 7234fdf851fdd5f09d8266e216e0dc74bcf0e83b SHA-256: 9c9581110cc0df8b8bbda8fde9c3e5a646338e1460a7c8c083fb5b96e055b754
156 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, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or distribute further malware. One of the extracted URLs, https://botokaw.ru/123, appears to be part of this link farm and is considered a primary IOC.

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
  • 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.
  • 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://botokaw.ru/123?utm_term=is+percy+jackson+3+coming+out PDF link annotation
    • http://nemosixumeki.mypressonline.com/waverorusuriwakeragijiros.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/wejumok.pdfIn PDF document text
    • http://nnorm-id.com/taylor_gs_mini_bass_maple_reviewp2g58.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/6767319.pdfIn PDF document text
    • http://strapslap.online/convert_3d_polyline_to_2d_polyline_autocad_20187px0n.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/3758136.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/how_to_change_a_brother_toner_cartridge.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/wuzalugiseto/jisimob.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/22314230568.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/edge_of_the_empire.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/attendant_console_standard.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/red_a_crayons_story_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/30522088725.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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 5564 bytes
SHA-256: adf16e92c67af011bf6409ee1723726e47cbd032ec045a47bdab22786c625537
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10772 bytes
SHA-256: e2d104d7dd0b896ca194d3a20e3ed8987c3c2af113e87ea788ccdc4542dee30c

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