Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f6fea13d59d9e…

MALICIOUS

PDF

72.4 KB Created: 2021-06-08 14:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 54808fa8ac6f2468337cab4bc8badebd SHA-1: 9335d066d12cd22118bf790679931a480594d4f6 SHA-256: da0f6fea13d59d9e166aedcdb9e7509804a8b234d95a288386ac018bd4ef2802
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm or SEO manipulation scheme. The presence of embedded URLs and the overall structure strongly suggest it's designed to lure users to malicious or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/pbw?utm_term=is+cheaper+than+dirt+good PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4419211/normal_60b4cfda5f751.pdfIn PDF document text
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/2169317.pdfIn PDF document text
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/ninubi_lisuxekewumezu_kafaganunugafi_jajise.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/nekas.pdfIn PDF document text
    • https://pajotesose.weebly.com/uploads/1/3/2/6/132681045/supipafige-serusapiga-tetuvoga-sofimugo.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/movimewakurota-zokutuxaperi.pdfIn PDF document text
    • https://lodoxile.weebly.com/uploads/1/3/4/8/134896768/5233662.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/815606.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/bujebiwexatiz.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/4827378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_604ce0acd5047.pdfIn PDF document text
    • https://vadurijale.weebly.com/uploads/1/3/4/5/134590900/xixubosinewadu-beboje-xuzovap-dajutosutap.pdfIn PDF document text
    • https://gulekizusivo.weebly.com/uploads/1/3/5/3/135392766/a0f0fdd1ee4f3c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144784173/gakemukekor.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/sifexukilumivabom.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/how_to_do_a_voice_clip_on_messenger.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/26090719594.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/f/html_to_dotnet_core_free.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/dayz_standalone_free_download_full_game_pc.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144773502/62189279402.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/what_is_the_concept_of_personal_selling.pdfIn PDF document text
    • http://matajin.pbworks.com/f/wuniduvodajesefawol.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/w/file/fetch/144500568/rudekudapiteset.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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 5240 bytes
SHA-256: ff0a002d91df9f0d3b2bdbe1f8e2f4d06780c1cc1e27a5a92c008f505be6d9dd
font_01_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 10280 bytes
SHA-256: b48a23b00733251f898e125aa3a2b387bb20a12ca24cd56258fc7e4115bc8c99