Malicious PDF — malware analysis report

Static analysis result for SHA-256 411c1b380f94465b…

MALICIOUS

PDF

90.7 KB Created: 2020-11-28 00:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0bc75f06a2a090045c313151e3d02f87 SHA-1: 9cc17b11fe7b83eabc2bcba4e379d35bd21c2437 SHA-256: 411c1b380f94465b21ef443cdc0c85ebb4102e3fc751d5a36712dc192cbfd76f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?utm_term=word+finding+difficulty In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f93f2cb74901.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f8842dee4666.pdfIn PDF document text
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/bakuropowozaju_mojuxupog.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/4984441.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/5746518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a176ca-3308-477d-89e5-1723a0e07988/pmbok_guide_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b47b1c-e150-4b28-928d-6ede279b38b4/wiritebumofutajunaset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25df501f-3fc0-4aad-8f43-b57ca20565f9/hbogo.com_activate_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/65219209893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041193c5-bfd7-4321-8f2e-f227990cdbfa/4747547094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4768c107-ff60-4b51-9d70-b09b8cfdf7d8/mibosiwudedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4708fa4c-4dcc-4d8e-a2db-36784ec859cb/10829486639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2814162-211b-4dbd-9523-4e920bdfab1b/74605922509.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_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 4916 bytes
SHA-256: c361785369f5c681ba39928146bccb443f4a5147fc9ef8031836f1feb46bca10
font_01_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 11120 bytes
SHA-256: 8caed47db2f4cef987bb9b8d90748a9688799d56cd2df7d9038acf7b0470075d

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