Malicious PDF — malware analysis report

Static analysis result for SHA-256 75512af6d25956b9…

MALICIOUS

PDF

74.9 KB Created: 2021-02-12 22:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e97e125185a0ec83c326607c346a478b SHA-1: efc220284d6bf06850ec368f8805edec4ed1812a SHA-256: 75512af6d25956b93b437ef8abd6403b44839d0a56bde34ec6e2070aa237a9e0
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of 30 external PDF links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially harmful content or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/123?utm_term=pioneer+1000+watts+subwoofer PDF link annotation
    • https://cdn.sqhk.co/nejijilo/nDZygiK/earth_wind_and_fire_albums_for_sale.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/f19dcb400d5e93.pdfIn PDF document text
    • http://domastmsk.space/cuento_de_los_hermanos_grimm5skp9.pdfIn PDF document text
    • https://dasukixarukawo.weebly.com/uploads/1/3/2/8/132814138/cad5f59.pdfIn PDF document text
    • http://2022god.com/91823015926caqx9.pdfIn PDF document text
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/xukawovusotonomid.pdfIn PDF document text
    • http://nakanilo.club/jabodosevurapaabya0.pdfIn PDF document text
    • http://yoga-italy.space/26815601895corvr.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/fHJPnHf/cheap_flights_to_vegas_from_seattle_wa.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/buroba_titiseped_wazine_ruzolobobule.pdfIn PDF document text
    • http://heleogose.online/53108795190nag4u.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/selunodowuredijak.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/nufujagolifu-tudaju-fobeveve-pozaxuvofoto.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/3436d0d8748a7dc.pdfIn PDF document text
    • http://techanomic.com/freesheet_or_groundwooduc670.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/fa55ccabb78958.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/giWtjhw/nifukameka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zavinawotomuvef.epizy.com/narug.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 5156 bytes
SHA-256: 718b5862b8d980751dbaa648647021d6e83402f696274ee8b9100e7af908688c
font_01_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 15760 bytes
SHA-256: b536b8877c36f685f6421b79d58bddb8a482e867420d3406641c07e85d65fe94

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