Malicious PDF — malware analysis report

Static analysis result for SHA-256 2689d3528b04c566…

MALICIOUS

PDF

141.6 KB Created: 2021-02-05 09:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 966e71abc6bdb4d7b6eb1e253420c5d0 SHA-1: cd4fd085fb8720bafa8eb4032e2e335e6ce98eb9 SHA-256: 2689d3528b04c566d2cf6e708dc3b7f0bc6416efa4351c3c87babe8054fbbb3a
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 pointing to disposable hosting, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=all+assamese+bhakti+song PDF link annotation
    • http://itprod.space/hodder_plus_edexcel_physics_a2_answersyff0l.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/85a41511a0db0.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/welim.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/gggfibW/fozibejime.pdfIn PDF document text
    • https://cdn.sqhk.co/livefodam/jiheidy/lowizazewagavozoduwomobap.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/Gifihgg/45816754013.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/27cf598d026997f.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/e901c30113e.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/1025642.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/guvovigo/building_website_wordpress_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/valor_gunlance_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/simile_definition.pdfIn PDF document text
    • http://natexekazedap.epizy.com/standard_date_format_in_france.pdfIn PDF document text
    • http://fetenebepoxoso.epizy.com/inclined_plane_problems_worksheet.pdfIn PDF document text
    • http://levowemorunob.epizy.com/albania_u21_fc_form.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_off0001f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F333 5196 bytes
SHA-256: 4d5fcd95244c70d26c705860def59bed144d189eaffee11a466e3027e4c28320
font_01_sfnt_off000204bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204BF 11036 bytes
SHA-256: 590259a38b1c195b7ba671f1761536b7845ae3e744e4e2218c9098844395b50f

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