Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9d9cae07082614…

MALICIOUS

PDF

70.0 KB Created: 2021-06-10 15:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85804f449690627e5b167f8d08ed25b5 SHA-1: 3efb96daf2bd7158ac9efe5484078a5f0235a4a4 SHA-256: cb9d9cae0708261409a282603276d2c81af5832315f1c77be42b610a7433e0e7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/pbw?utm_term=big+nate+15 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379964/normal_602a04fc2bab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_601226fbb4715.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/332905.pdfIn PDF document text
    • https://wejapofi.weebly.com/uploads/1/3/4/5/134590092/9700752.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/2451831.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/bujipukujijom.pdfIn PDF document text
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/218456d8.pdfIn PDF document text
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/5972901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_604323bec837d.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/1267888.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/1127709.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/xepibafes_naleninega_lamun_xobab.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/caf8ed1959b7a95.pdfIn PDF document text
    • https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/1995707.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/desaripifa_mesenugezabes_kizazeni.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/funipezat-vigoga-lovota.pdfIn PDF document text
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/xikatetidex.pdfIn PDF document text
    • https://gerozelijoxujib.weebly.com/uploads/1/3/4/4/134476991/18cc12.pdfIn PDF document text
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/gufazopa.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/4aa6719ad7.pdfIn PDF document text
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/12c5a51c5b112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_6010840c7f848.pdfIn PDF document text
    • https://sizosunobefema.weebly.com/uploads/1/3/1/4/131453016/5581599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 4772 bytes
SHA-256: 2985fefcab4280363667ad9acefe920c9abd5895728dc72bef0ca2af053f6711
font_01_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10420 bytes
SHA-256: 012f438af829d3938c33c51d8807a6abbbe8f26cda7162162f0a047a44d545a5