Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bac657ca7369267…

MALICIOUS

PDF

58.6 KB Created: 2020-11-29 10:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a8da1b7a84b24eee312aace7f39391e8 SHA-1: 9beac9b25540d6e224570375d7a6f55b0c304c88 SHA-256: 1bac657ca7369267ebe1eba149e414c24be6c8b4f296bb3391f19248bd378bb4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Chota Bheem cartoon website' and 'wkhtmltopdf', suggesting a lure to disguise malicious links. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to direct users to external sites.

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/aws?utm_term=chota+bheem+cartoon++website In PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/modifuxiremozun.pdfIn PDF document text
    • https://wozagadukuwa.weebly.com/uploads/1/3/4/4/134483903/86d6a37630dd41f.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/e4f564b9638.pdfIn PDF document text
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/nozoda.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/e078418b-10a9-490f-bea8-88f287874891/wirizebuxexadogomemegubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11907ef-8a0e-4bb7-b17c-9ae1ff5d9692/pixazubepojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efbd97e8-71dd-4607-8bae-e2cd203e77c5/japan_how_do_they_celebrate_christma.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/is_copper_sulfate_an_ionic_or_covalent_bond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d3f041-f99e-479c-ade3-d1d5969e5f3a/61746020810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f4dad7-8663-48d2-8942-c7cc121392ab/87878185265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65906ff7-553c-4873-8e65-48726cd53d7f/first_in_first_out_algorithm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547c6a13-182e-4262-9b1c-6a29f79494ec/10618822781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d053f9-34eb-4d09-933b-aa4aa6f1f3d0/tcnj_lesson_plan_format.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_off0000abae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABAE 5144 bytes
SHA-256: 98a53e0adfe42020b64d509bcfdd222576588c0a61e5dd664e1b654b1553a7a3
font_01_sfnt_off0000bd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0B 9640 bytes
SHA-256: f1d7d3e52e401550c036cfd27c4aac2f121c367a1717f61dfda7230ec115e8de

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