Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dea1323b9171bd0…

MALICIOUS

PDF

68.0 KB Created: 2021-01-01 21:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59b1acb57fc9fe2dac73dd74da59bd2e SHA-1: 139ce007faae125a638fd3ba45b0bffdee649eef SHA-256: 5dea1323b9171bd04ae01a192f243a5ba579e42e747479e7c39f8aff13267030
214 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically `https://cctraff.ru/strik?utm_term=cake+recipes+with+cake+mix+and+soda`. It also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=cake+recipes+with+cake+mix+and+soda
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/9427624.pdf
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/f74cdb456e0cf1.pdf
    • https://zudilutunab.weebly.com/uploads/1/3/4/5/134588168/74ac36.pdf
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/bijonoxop.pdf
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/lafelixopipama.pdf
    • https://radopubida.weebly.com/uploads/1/3/4/6/134608457/rogodasanusalit-gawana.pdf
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/247902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gizonukorad/ludoxowasemepegag.pdf
    • https://uploads.strikinglycdn.com/files/b5653652-d60a-47b2-8eb0-c5417e92cae6/petemerotel.pdf
    • https://s3.amazonaws.com/fomudebipefasu/bulacan_state_university_registration_form.pdf
    • https://s3.amazonaws.com/sajatesawodiji/common_suffixes.pdf
    • https://s3.amazonaws.com/xeponodij/cursive_handwriting_guide.pdf
    • https://uploads.strikinglycdn.com/files/1dea93e2-350c-4270-9c42-8fca322485ea/why_does_postman_compare_watching_tv_to_a_game_of_peek-a-boo_answers.com.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_off0000cd7d.bin
73e702fc7432e27f04f74a7f5a63f5dc20c69f7ddb527ca35758261dc6c15085
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 5412 bytes
font_01_sfnt_off0000dfcf.bin
beae828ae796747b49eae4077f1c38061ad621a7765c63395b082b3bdb3400fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 10436 bytes