Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7838202498999a3…

MALICIOUS

PDF

70.0 KB Created: 2021-01-12 14:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5cbe087a40fd2ddf5284e947924ddefe SHA-1: 60bbf0bc397940e4a4774a149e2288caffb14560 SHA-256: f7838202498999a3c2a26e982d7203122d86157074b6fe08916e4a5d0504abae
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=capital+gains+tax+computation+template'. This URL is likely used to lure users into a phishing scheme or download further malicious content. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/aws?utm_term=capital+gains+tax+computation+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5fdac65ea4715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5fe4c685c1b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_5fb58f31b9654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5fc7de6929458.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/7aa48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_5f954f31e0152.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5ffb59a64ae79.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/pakidugomojowovomus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5fa353026bf3b.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/jiwokimaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 5128 bytes
SHA-256: 8e9f2886b98ed22360b63e70c4cca56e58ea7d8f9a5f89e9c08b4c2ad8a0714d
font_01_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 10228 bytes
SHA-256: 7ae20e3e2be0a5717031a1d398982a1162a6afabf60ebb3b1e4d69935183c13e

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