Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea9f770431d701c…

MALICIOUS

PDF

91.5 KB Created: 2021-02-12 19:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a3d9fce70cf7726c5db4387a4bbf0421 SHA-1: 5383c8661c4a1e8a43b683f816c58da4aacb5a3a SHA-256: aea9f770431d701ca76d3938edb90332ae5ccf553b5e1e978a7fc1d89c5294a1
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 pointing to disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious 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://druttle.ru/wix?keyword=e+math+instruction+algebra+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484815/normal_5fe0c235bb663.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/5383792.pdfIn PDF document text
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/rivilalipadibogif.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/motupejivuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/dijadive/ZdCW2gd/mofusuxowebaxifo.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/foAhjXj/ladowobix.pdfIn PDF document text
    • https://pomugulawes.weebly.com/uploads/1/3/0/8/130814995/1739450.pdfIn PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/wumipasak.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/gifiz/56396052012.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/52744917841.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/whatsapp_status_video_free_2019.pdfIn PDF document text
    • http://zadosuwiwebuw.epizy.com/numukozunirivubedopanupa.pdfIn PDF document text
    • http://xubulaxojetuka.rf.gd/dutobasutijomawujex.pdfIn PDF document text
    • http://bebezira.epizy.com/chain_rule_worksheet.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_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 5364 bytes
SHA-256: b657fbc26b549f026df6690e817a13ccf84eb655f41e8361b1877d6e614287d2
font_01_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 10876 bytes
SHA-256: cc3a0ae3b66acac45fed7376da66848f0dc3fe4f0dcad253e1bcfaa948b5bea2

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