Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e5c29da4be505a…

MALICIOUS

PDF

79.4 KB Created: 2021-02-06 04:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a0a6894a3806e99937f079543dc4af8b SHA-1: 176e1590df6145ada4f2aa1c8137c2f15dbd211f SHA-256: 98e5c29da4be505ae997571da3f03817f7684001ff08c71b0e43ba823c674ed3
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to distribute or redirect users to other malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=national+sorority+of+phi+delta+kappa+midwest+region PDF link annotation
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/2028609.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/hovxcMp/linda_brown_interactive_story_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fe82f291984f.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/wasesezikup_pefax.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/wilawo_niwekib_bimekufasezuwob.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/mozeviwum.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/731051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_601a4fded80c5.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/2231633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ffb78bbea0a9.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/cgjheib/1325842517.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/WHShhii/50207925885.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/8f361865fd2.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/jcjcJqL/80539697262.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/wivunonovef/11874630533.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/exercice_corrig_sur_l_atomistique.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/dubusu.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/jiboboviko.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_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 5680 bytes
SHA-256: 0f1cfda6858a1cb95b140a83f52b0e72b949cd2c1aa58514a1be005e8d110e70
font_01_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 10720 bytes
SHA-256: c1080feafe37716bb538dbf93c4626ea85a777cbd25fc3493b21bfe0d78cf1b7

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