Malicious PDF — malware analysis report

Static analysis result for SHA-256 6659fd09b932337a…

MALICIOUS

PDF

82.8 KB Created: 2021-05-08 15:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 72648e68086f52e4f0bcc4cd4b072b91 SHA-1: e4a5b7de259f4eca2d6792a45a3806e161ad5947 SHA-256: 6659fd09b932337addcea55abf9bd33ff37711c9e413cadc10e89e7f07143bcb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal appearing to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://botokaw.ru/strik?utm_term=how+to+replace+headphone+ear+pads PDF link annotation
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/xiletofesonulisixi.pdfIn PDF document text
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/norafizaxe_besigivifiwu.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/wilupidona_salumelubukelij_sazexo.pdfIn PDF document text
    • http://prognoz-football.club/nolotuvegidozofaletosoejmvy.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/1404635.pdfIn PDF document text
    • https://zibitevurus.weebly.com/uploads/1/3/0/7/130776177/bomidikog-radoninixog-xutoki-kepuwizurezev.pdfIn PDF document text
    • http://podeves.xyz/mr._rebates_cash_back_savings_bankb7ib7.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/73420603938.pdfIn PDF document text
    • http://gadosamu.iblogger.org/24860555203.pdfIn PDF document text
    • https://xifuforemavu.weebly.com/uploads/1/3/1/1/131164534/givokebewe_xufuzozud_jejogagepuluz_bepiz.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/09298807.pdfIn PDF document text
    • https://xiridibokolu.weebly.com/uploads/1/3/1/3/131379099/luxawekil_fuwujifeba.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/casa_luis_barragan_planos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_a12885af46224036854ed861431a2b95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/deool_band_ringtone_zedge.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/69998257860.pdfIn PDF document text
    • http://pokuzanu.epizy.com/13544229493.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_44aefca96b914cc8a6e732aea3b4130b.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_23e57664711b43d3aa4f91677eed1650.pdf?index=trueIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_ccd2161b31b74e1bbee228788bb2276b.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_21644211a4954d02aee2e4c1368ec54c.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_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 5212 bytes
SHA-256: 78fac270fb251c6127c7667eafabc1c205d4ac076455a4f428673999c24e5d0c
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 11452 bytes
SHA-256: eff547c616b6cbdc6f6430ae5d74696a0a960cf1888f0becc500a8daffda878c