Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebbd563e23510e6…

MALICIOUS

PDF

83.3 KB Created: 2020-12-06 02:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ee4ca95858048e3ff21b9c413f6c8ea SHA-1: 735b486e5df21a6023b86b9f0a71ebd87722f088 SHA-256: 2ebbd563e23510e613c312b41abf97ad63f9aa56ac5df1358a1b9fbcdb974cd6
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' and another flagging a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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?utm_term=hymn+for+the+weekend+violin+sheet+music
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f88b3f4bf6a7.pdf
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/wafili_pojutap.pdf
    • https://cdn-cms.f-static.net/uploads/4427076/normal_5fa2f4b55c815.pdf
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/rasojitapobe-datur.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f879d9c66808.pdf
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/kanixisebuzabu-jodabelik-janidiziroxegoj-faxali.pdf
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/fapibuvane-teputeko.pdf
    • https://cdn-cms.f-static.net/uploads/4459774/normal_5fa0ff7574369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunojipu/japugilix.pdf
    • https://uploads.strikinglycdn.com/files/af455b72-b9fb-4486-a50a-56e2e77730d7/wositogogap.pdf
    • https://uploads.strikinglycdn.com/files/88e96a02-5cff-4e45-a024-48e69affe3ad/56370144468.pdf
    • https://uploads.strikinglycdn.com/files/dc397f5b-d9c2-41a8-af40-18e4f62e4130/depetuxisiwavemiremus.pdf
    • https://s3.amazonaws.com/pubopelej/reading_comprehension_practice_sheets_4th_grade.pdf
    • https://uploads.strikinglycdn.com/files/31da023d-178c-4e7b-b35e-f2c58e03ee00/kamasutra_el_jardin_perfumado_online.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ae.bin
78892e6675cd3683baa3cc39533514b7415a102235619f0bc3e3c066171dbd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5332 bytes
font_01_sfnt_off000103ca.bin
813c87fa6de49ecf9e3648a4f8d2164a5bbdf668557945dd6711921dd948bb16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 11788 bytes
font_02_sfnt_off00012ac2.bin
b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 16100 bytes

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