Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1cd39c5375ef65…

MALICIOUS

PDF

68.4 KB Created: 2021-01-04 19:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6afbce263538c75a8740c8cb45fdeea5 SHA-1: 735348de5b919ff822e2df7f3f5fc86d10717943 SHA-256: 1c1cd39c5375ef6519737c9c5440d1fb99648f663f7c79f2c97b21e4ac5e20c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' that points to external PDFs. One prominent URL, 'https://trafffi.ru/aws?utm_term=pandora%2527+s+box+6+manual+pdf', suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=pandora%2527+s+box+6+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fce27c2a578e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369903/normal_5fc672b8136fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5f9897b614031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5faf79e754eae.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/3129536.pdfIn PDF document text
    • http://www.opentle.orgIn 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/f15c0742-1928-4652-9517-38d9161ebf8b/ralunogupik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63833192-4baa-4d9e-a76b-348069c3a145/fovuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e427c2f9-f580-49b8-9059-9edfb69f763d/vakaporutobesugifotejibek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945f14f3-072d-4ceb-b29d-00b5cc63574c/residual_functional_capacity_form_for_fibromyalgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfedcfe-dca7-4406-9204-d20457d1b913/william_beebe_1606.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000cbae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCBAE 8128 bytes
SHA-256: 856c9222e5ac47840899d2e04922c29f764df7ba4c966fbe87f320dbd43ca9e3
font_00_sfnt_off0000b8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 5584 bytes
SHA-256: f18c8c90c2f6146cd060bb6a439421bf19d935f015ea2f7a2ccb5f0bd5f8423f
font_02_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 10088 bytes
SHA-256: da680a84f7126d531325f0f73a056c9339281abf63327c4df900a41a0d07d9e8

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