Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf5c17d68125d13…

MALICIOUS

PDF

72.4 KB Created: 2020-11-11 02:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af7971669f7dcc58d5e4624568498cd1 SHA-1: 7a46f7aa0a0386a54c1ea7b81907f6e382a9f2eb SHA-256: baf5c17d68125d1396add0f09fd3745bac59ba00f3f24a6b661853f92f12ab5b
214 Risk Score

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 pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to the PDF's creation, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/aws?keyword=ib+learner+profile+reflective+definition
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fa0510d6958e.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/3e40ee2b3800.pdf
    • https://cdn-cms.f-static.net/uploads/4420767/normal_5fa5c32098ea0.pdf
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5f9c11aae624b.pdf
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f95e864397d0.pdf
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/vuvapomunaminaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/10b4d573-352b-4363-8f1f-100e16b00701/dopuzajubibigawurexe.pdf
    • https://uploads.strikinglycdn.com/files/9bf6154c-87cd-4897-9e84-0e6f460bd2bb/52008547995.pdf
    • https://uploads.strikinglycdn.com/files/7e516c1c-8b70-4148-b52e-0bba55ed9abe/34947317355.pdf
    • https://uploads.strikinglycdn.com/files/626b7038-900a-4e5d-ba17-2211b1e10d72/king_alfred_plan_rex_84.pdf
    • https://uploads.strikinglycdn.com/files/076e7f49-d98e-4e07-abf2-c5d064cd4532/80470721561.pdf
    • https://uploads.strikinglycdn.com/files/589add38-d943-413a-bcec-bc3b5cc0df86/sorusujewuzome.pdf
    • https://uploads.strikinglycdn.com/files/11405dfd-bb9a-46c2-b060-ab1d0c131100/feminist_theory_reader_4th_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/cfc8e754-4ab1-4dde-ae62-d636688c9a37/seagate_backup_plus_portable_drive_model_srd00f1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d126.bin
e414c87c365bd1208c601af34102a116cbc11dcd0fc576de381b0d57a2aa1d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 4896 bytes
font_01_sfnt_off0000e1c7.bin
f7a47b2a058deb9b0aa2d17806a572f543df4a3bb20c21987ebcc07b24e3ab2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 10820 bytes
font_02_sfnt_off0001064a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 4324 bytes

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