Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a13f9b6c4cd34ce…

MALICIOUS

PDF

87.9 KB Created: 2021-02-27 20:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2ca9381edd34fce069009a28dc39e30d SHA-1: 89a92240d2b61d454da3890e110133563e48bab4 SHA-256: 3a13f9b6c4cd34ce45767b477657fdef6fb9b19ab8cdb8c47f0f23f5db4a10a4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=precision+sewing+machine+oiler PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417645/normal_60273bea07cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_6023cbf9ed9f6.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jfmggew/73316880598.pdfIn PDF document text
    • https://xalokelunubame.weebly.com/uploads/1/3/1/1/131163690/gixijuvedem_zawebipekobugon_rojikebamupito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5ff1fc5dcc5c8.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/hcjjgez/41534217339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_602c2238e880d.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/5200548.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/gi0ajaC/fold_up_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/gdhaX3a/nozidajomedogapuzuxanuz.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/7b5a4ee1470ff.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/3955577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/47174459417.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/13403781788.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/duretilawubuz.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_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 5304 bytes
SHA-256: 60b80e6da8eb67d4fd34ebd30d5a72c5896488e51d80b132ca21e0d5d7dfd070
font_01_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 11032 bytes
SHA-256: 9cac958472fdbf40dea7eeb78cf28c2b6efad818b4bfeefe172f5f8bb00da509