Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca19b0b4596219d…

MALICIOUS

PDF

78.6 KB Created: 2021-04-27 02:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d3facfcf6caa30b0deae9246723a4a94 SHA-1: 21f99014ee622653765bf8f41a612c9592a9ad92 SHA-256: bca19b0b4596219d132c699493c8b69ebc36c756d6da0ce917b74f1818d685d4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/strik?utm_term=employees+only+nyc+yelp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480581/normal_606377c09d526.pdfIn PDF document text
    • https://mumimobubaw.weebly.com/uploads/1/3/4/6/134640569/tidubari.pdfIn PDF document text
    • https://nimukitu.weebly.com/uploads/1/3/4/2/134266418/5533c80273d406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_6031fe05c453b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_60689443c32bf.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/what_is_the_difference_between_general_purpose_and_specific_purpose.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/8824577.pdfIn PDF document text
    • https://vinatisuxuzelo.weebly.com/uploads/1/3/4/7/134770563/85c7d10.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/visidisofokip_vafujaperib_dikal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475864/normal_5fca2e6c81281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_6000d56e55dae.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/woxudikolipa.pdfIn PDF document text
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/2c1326d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_602fc179dcb94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_603d590c6469e.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/marketing_campaign_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449599/normal_5ff7ce5ad0746.pdfIn PDF document text
    • http://gnoogle.site/1786601217802zrd.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/4daa7f8cdfb0ed5.pdfIn PDF document text
    • http://hdvideo.design/catia_freestyle_tutoriali4q6k.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/9946454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_602d7d1c3b123.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/sarik.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/jirufetazeze-xetupetiwe-dodis-lalibemuda.pdfIn PDF document text
    • http://usacreditreport.info/pesasojowjek0k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_60364c9bd585e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/tulagebo.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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 4832 bytes
SHA-256: 0d86e36e842debec46fe9f471505aade842d19eba3df0841e3c7c40b5953e291
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10944 bytes
SHA-256: 8db7dea2c20006744fd5d682df69536dddb6081d289cc4758acd3b3ee4bb0828