Malicious PDF — malware analysis report

Static analysis result for SHA-256 65448dc9d5304c3c…

MALICIOUS

PDF

89.6 KB Created: 2021-02-25 19:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4248e84a7bbdad6ffdca667c6d0c7b95 SHA-1: e3d3b36ed885fa136a559394f1814de1b7aa281f SHA-256: 65448dc9d5304c3c210e77e9bb6a424f0a5f46476036b5c41b73b287848c1403
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is classified as malicious by ML and ClamAV. The document body, though heavily obfuscated, appears to contain product-related keywords, suggesting a lure. The presence of multiple links to disposable hosting further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=toro+521+snowblower+electric+starter In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_60069e6150527.pdfIn PDF document text
    • http://faxagigotitij.66ghz.com/74106171249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_60335b6a2b589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5fca8659972e6.pdfIn PDF document text
    • http://ideaita.fun/choreographic_forms_in_cha_chal8p13.pdfIn PDF document text
    • http://getyourcredit.info/english_hd_movies_free_for_mobilehimtv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5fe0426056adb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/38949718139.pdfIn PDF document text
    • http://lujolugajejizog.epizy.com/18698060496.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/attorney_client_privilege_waiver_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/tenefobujumavareg.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_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 5284 bytes
SHA-256: 268a85ee22881cf65c5a6407440b665641c25b03b98f65ee8b1d6a48cda7ec8d
font_01_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 11672 bytes
SHA-256: b2e9f5d4245661caebae53bb3863cd7296763b9d9a6a97ec316540d1912fbf87

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