Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6d5a1fb1c50533…

MALICIOUS

PDF

75.4 KB Created: 2021-05-21 16:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ea0158c8a73c6f6999912e483e5f54df SHA-1: 223c7f3c5a5d48d207d266ce4f654b68af2df023 SHA-256: 0d6d5a1fb1c50533005c67702aa201b2a43120dda638584d96e07e3115670866
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic specifically indicates that an image lure is used to redirect users to a phishing site. The embedded URL `https://leonvi.ru/strik?utm_term=attention+getter+for+informative+speech+on+autism` is the primary IOC, likely leading to a malicious or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=attention+getter+for+informative+speech+on+autism PDF link annotation
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/59c2a01e430512b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5fcf5cab168f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd34dbfd0799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_6052d13fefb9d.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/natuzofegikekax-mevulufoduwogud-susomimigale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5ff52b73764ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_6060374b0de9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_603a7aa10ac0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6029e7af29ba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_6051811def574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fc76ec5ce168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5ff88e01a5e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_600dc5c8871c0.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/tedowafomaru/loriv.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/golds_gym_power_spin_230r_console.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/cghs_card_form_c_d.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/33128339993.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5448 bytes
SHA-256: c739c121b1d1087310576d04d8d6ccf31de085837ff6eeee0b59b9b51f74f0db
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 11048 bytes
SHA-256: 38fe5685ddee44d536ebca509a61057151616da98570ea1a695f430a3f560750