Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebfd4f0aaa7814c…

MALICIOUS

PDF

61.0 KB Created: 2020-11-13 10:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bad512222211d2b45867f68a1b26109d SHA-1: 72f29d1681ef8b867ff7778ce000a9bffd38c0cb SHA-256: 7ebfd4f0aaa7814cc4f8e8a071de26bc945058a82e7fdf0d9e178adb88703139
214 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, directing to 'https://cctraff.ru/123?utm_term=wave+equation+problems+worksheet'. Additionally, it exhibits a PDF link farm with 22 external links, many pointing to S3 buckets, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/123?utm_term=wave+equation+problems+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5f9ad519c82eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f87382f4473c.pdfIn PDF document text
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/51546b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_5fa7d7edf2fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_5f98cd1240357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f92bf02ddc1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fa2cb390c469.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/bevekizadoxuj/every_good_boy_deserves_fudge_album.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/fokikefuwunigovukeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1495958d-56cb-477a-9658-149f0a42ccf7/varerulikijotapi.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/marvel_1000_wiki.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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 5556 bytes
SHA-256: 764776955bf2de37a654a56798fba71fc7a11d4abac5f15693e11f1eced5d904
font_01_sfnt_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 9908 bytes
SHA-256: 2a1143c3c12f595ff32e14b6afc949a2e66ecfc189f193b03a4c365dff40a821

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