Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce98ab465ee35dee…

MALICIOUS

PDF

79.0 KB Created: 2021-02-28 15:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5f46a8fea117cd167afe4eca95115ba SHA-1: 2f1e704cb750b11d9fe49af84d1c8845f6cbb17f SHA-256: ce98ab465ee35dee8843238e93d00284d369c9baa11d2d5f7908405a714f91cf
156 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 Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and a high ML score suggest malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=which+of+the+following+is+an+example+of+a+computer+network
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/forelav.pdf
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/gabexa.pdf
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/rojodonaxotagulak.pdf
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/zibofizi.pdf
    • https://nojonepidafajik.weebly.com/uploads/1/3/0/7/130775859/dajuwifeda.pdf
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/favuzolapaxaw_noxoluruwonumol_zetazuzirurupe.pdf
    • http://lifeit.pro/catalogue_template_word_free86bge.pdf
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/pawunugiwenaxef-gilewejenid.pdf
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5ffc5b7a723c6.pdf
    • http://itdomen.fun/kitepuwizatadisevp0wgq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jalasilunaz/mevujolosifamulur.pdf
    • https://s3.amazonaws.com/magapeguwabe/kixode.pdf
    • http://bukusisege.rf.gd/kenworth_t800_maintenance_manual.pdf
    • http://nupusadulawux.epizy.com/sample_ballot_for_barangay_election_2018_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a3.bin
bad68707c9e6af9f2857e46099fb4c408ab4196a5f16d4fc08874e2ebddc88cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 5664 bytes
font_01_sfnt_off000107ec.bin
dabe7b6e7f58b43f77e641bca2492c00d91ac3a4bcdcbb291f29e80900785f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 11508 bytes