Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d726f435b73aa82…

MALICIOUS

PDF

90.9 KB Created: 2020-12-10 21:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a904dddb10d07adea60a82fc7ee961 SHA-1: 73aa8f19a63204beeb9ae0003ac23107c7329e74 SHA-256: 9d726f435b73aa82c4a5069aeaef94986b03a34eb74afe5af50c6467da7d0122
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, suggests a lure related to a book summary. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/123?utm_term=tuesdays+with+morrie+summary+in+hindi
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f89b0ab3d144.pdf
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fb85d664249c.pdf
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f8d15c39c2e6.pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_5f9d499f7a9fe.pdf
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5fac5c8a3bcfc.pdf
    • https://cdn-cms.f-static.net/uploads/4413242/normal_5f9776f149c82.pdf
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fbee20166667.pdf
    • https://static.s123-cdn-static.com/uploads/4369769/normal_5fcf57b345484.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5fa6180aae829.pdf
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5fa22de9876f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/939eb053-1d14-4fd6-82a3-9ff709e15b9a/62297329208.pdf
    • https://static1.squarespace.com/static/5fc6cca5e2afa34b64aa8fbb/t/5fcb8aaea3bc3d1915303a34/1607174831742/78374178726.pdf
    • https://uploads.strikinglycdn.com/files/d74d8a81-877c-4254-866c-8c19615c5892/solving_two_step_inequalities_worksheet_maneuvering_the_middle.pdf
    • https://s3.amazonaws.com/dudurat/74573289339.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_off0001272a.bin
2b15176e2a3b37b204891c65a3967cea3f7e46172a2e4ea2232543e6fe3782a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 5176 bytes
font_01_sfnt_off000138ad.bin
387c43f13b2604efcfe58cf57c5f89e53f445348c335e418fd20b2259dab8053
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 11072 bytes