Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb930ae32e57cc1a…

MALICIOUS

PDF

71.4 KB Created: 2021-04-18 23:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ba478ffdf4b0a81fae790dacebab8bb SHA-1: 23d6dc02b91c87c9bb27db936cdceda3e46c1a0f SHA-256: bb930ae32e57cc1a97f3e07446299aceb91be342aa765b5fb9cb3f7ee196deb5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://botokaw.ru/strik?utm_term=comentario+biblico+online+free', is flagged as suspicious. The ML classifier and ClamAV also indicate maliciousness, suggesting the document's primary purpose is to redirect users to potentially harmful sites, possibly as part of a phishing or malware distribution scheme.

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/strik?utm_term=comentario+biblico+online+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fc67a5cdbdaa.pdfIn PDF document text
    • https://cdn.sqhk.co/jumibizede/ieZDfhi/beneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_60401ca51a152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_6058debfbd401.pdfIn PDF document text
    • https://cdn.sqhk.co/feruwapusux/QgfdNX8/vertebrate_zoology_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_600c97e791f50.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/8e9d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fe590314b86b.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/nunejimizujazav.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/ihZjjuu/38022369462.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/jdlgdto/chicken_pound_discount_code.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/iyidBJF/clan_race_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fcf6325acf85.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/jcOIib6/o_othello_movie_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_602eb556695a6.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/3fbd17aa-b308-4cdf-a5a8-b9c11245e80e/how_to_connect_to_a_nyne_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d982c6e6-e5f0-485f-932e-a719ad7108a8/61474256875.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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 4800 bytes
SHA-256: 5cec1aa4bc0d4735686811998016e19b9c573cc597ccf9c80d554cb69f767ada
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 11128 bytes
SHA-256: 2b52fa233e15067a931d7f008e1290c6d15e811ce2258c9791d44d7fc91a703e
font_02_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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