Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d8f3c24b2c54e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-25 10:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69bcdb17374221337a11cb996f77044e SHA-1: 50f727a1cf58ee183b639abbbb2ec15c56a7e5e4 SHA-256: 3f2d8f3c24b2c54eec710bf4d1ccb2bf826bec2d6bf0780b6f6e11507168f81b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=graco+modes+click+connect+travel+system+base
    • https://cdn-cms.f-static.net/uploads/4490141/normal_600a2089dd1df.pdf
    • https://cdn-cms.f-static.net/uploads/4490122/normal_604e369d41820.pdf
    • http://epipog.com/delta_tools_band_saw_28-180_benchtopd4lh5.pdf
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/rorifibawo.pdf
    • http://ita-bio.space/pubuvamugotofigowijmw9y.pdf
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/tizun-vaxox.pdf
    • http://pycnidwzxc.info/toritipopuqu7jn.pdf
    • http://ighelpcenter.xyz/824105154720nxnu.pdf
    • https://cdn-cms.f-static.net/uploads/4489050/normal_603a22143f1ee.pdf
    • https://cdn-cms.f-static.net/uploads/4425491/normal_603cb23d64935.pdf
    • http://1xbet-football.fun/2006_chevy_malibu_ss_horsepowerr8692.pdf
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/vesewofewilo_zefutivi.pdf
    • https://cdn-cms.f-static.net/uploads/4446170/normal_601e8277268f1.pdf
    • https://cdn-cms.f-static.net/uploads/4505363/normal_604cfc2c9405c.pdf
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/namizav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mebapuperepomuv.rf.gd/wajokewodirozirukedi.pdf
    • http://xovebezot.rf.gd/designing_power_amplifiers_stephen_kamichik.pdf
    • http://zumewozuzetarun.epizy.com/accented_form_of_you_for_hagrid.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_off0000eb5c.bin
cae80673e5eb1cffc76270557b5d54fb03fca549f3521d3d430a0aacff61cf76
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 5480 bytes
font_01_sfnt_off0000fdf4.bin
22a18e56598f51ea7b8c478c3a857b6c4f0ca26011931ecabbb8eb0aece8539c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 11024 bytes