Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfba402183b3183…

MALICIOUS

PDF

84.8 KB Created: 2020-11-19 07:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb050c2be65dcbea3ac926a66284730 SHA-1: 43e5b582edc80ed7296b2b361a433df9fe05f9f3 SHA-256: dcfba402183b31838c31cc62dd1406535c67f410d4ab4e79a9042e5b0fa0528d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=xjz+survey+remover+bookmarklet+chrome
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/sodunu.pdf
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/xuzukim.pdf
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5fa47737c5a6b.pdf
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/junusizugumo-dajuvem.pdf
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/bepex.pdf
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fb5d0f75673a.pdf
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5f99447b26bc5.pdf
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/nazafa-pidikexazug-kavolodiwo-jogesikuwuner.pdf
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f9eb45eb5367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/napisakaluja/dupipibevus.pdf
    • https://s3.amazonaws.com/bubodeliza/sejpme_ii_module_2_post_test_answers.pdf
    • https://s3.amazonaws.com/ginutu/bimagivixuvariwuxiviwodu.pdf
    • https://s3.amazonaws.com/suxiweke/woxoposuzasejemurat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a5.bin
b8fd7867d8d628fd096f2db40d5703c43a26db6627859944dfaa014a27d45efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 5236 bytes
font_01_sfnt_off0000f890.bin
ba8e88013892c54889acbbe2d166109188d868e8b5420a862bbde277b2874443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 12360 bytes
font_02_sfnt_off00012295.bin
86438bd81a3a232cc80d27492c0170df0d0fd4f5ccb22f26f32a4c48c561dd43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 16248 bytes
font_03_sfnt_off000137dc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 4324 bytes

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