Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3a59b86df2bf2a…

MALICIOUS

PDF

71.0 KB Created: 2021-02-17 18:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 32501c1d97298346a36f059671384b1a SHA-1: 940d9171af6fd3578a1926fae64a21640d4ba5b6 SHA-256: 1d3a59b86df2bf2a446915f741d9ae96a87f8e87ea79585ea7e15aa57f1f64f4
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, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=focus+on+form+vs+focus+on+meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5fec12d4b746e.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/dawigosavuwir.pdfIn PDF document text
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/647f65b09f36f9.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/7643294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_6011d08de6166.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/gebghs1/kipaxajubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5fe3dc7480e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_6022995c81105.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/zigovumapiripu_borawijevikon_wimari_solatasakuvo.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/3025754.pdfIn PDF document text
    • http://cocobeautybar.ca/limizulidatexudakelewel8g4yk.pdfIn PDF document text
    • https://betufevu.weebly.com/uploads/1/3/4/0/134098732/xakemav.pdfIn PDF document text
    • http://basiditdcf.space/muritorolukisobajiduxidaz9srip.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/nbme_18_downloadknjif.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/hnHgiva/bts_dynamite_lyrics_mp4_download.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/7494701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fd680e2d1a21.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/dYHg5Kl/84522754261.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_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 5184 bytes
SHA-256: ec01a656acb8e7f2b7278d280098559cda997b0d64065a4a65f4095d4613e778
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10160 bytes
SHA-256: 67cf0748784058c0202b122355ad8491a97d8a124e12153be281b3d8ec256633

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