Malicious PDF — malware analysis report

Static analysis result for SHA-256 16046b45fc6ea6ca…

MALICIOUS

PDF

83.6 KB Created: 2021-02-18 22:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 39e959f6306f137dbaadc2965832459c SHA-1: 5d07a623e4a99360264527b59f930daf9d62c856 SHA-256: 16046b45fc6ea6caaccc33a6e528d9a0ee72e511d6b943467e10132d24c394d2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a campaign to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://leonvi.ru/strik?utm_term=nancy+drew+movie+trailer+2019 PDF link annotation
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/91c4bbff90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_60072c33795a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_600a1737b2219.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/6288310.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/zogogur.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/sufufetomabupaxa.pdfIn PDF document text
    • https://kowokilu.weebly.com/uploads/1/3/0/7/130740572/lisama-vuvewu-venox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_602c7dcdd6c9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5ff17b09de4f8.pdfIn PDF document text
    • http://espaceabonnes.com/78588811277p93q1.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/pojatixutasirit-nofapu-mewawisowolefov.pdfIn PDF document text
    • https://bamebifubakuta.weebly.com/uploads/1/3/1/4/131408159/kawajuzizi_kujanutukadew_miwaj_zutunotaxofana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_601604e805d7c.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/2498507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_60063b32dd86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_60277441bdfa4.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/bedut_famesuwazodolog.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/9e26b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fd9139e3f967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_600f6bf30d73a.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/fasixepar.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_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 5612 bytes
SHA-256: cfa50c9fbd0d8e215d98623a6f0622e9ecd69548a8b85c5b39ca3ba57ac82563
font_01_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 11656 bytes
SHA-256: 05dfdc74017f7b0536b410b0ebab96eea9c30d81fbc77b4fd1fb99ffc93730eb