Malicious PDF — malware analysis report

Static analysis result for SHA-256 186cf0ba8303a51e…

MALICIOUS

PDF

71.6 KB Created: 2020-11-14 11:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b33b4a73ad49c1dd8406f657d6dbcac4 SHA-1: 074348682b8fd195ff6ed4d2286bea7367a77cc0 SHA-256: 186cf0ba8303a51e8713584257cff90eb50300598cf5b8029f280892ac55ef04
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to an assessment, suggesting a lure. The presence of external URIs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=developing+the+leader+within+you+2.0+assessment PDF link annotation
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/paguruvubumuluf_vodifafuke.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/55e31e7d40db1.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/bc3c77c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f9b4248e4541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f9e6559555ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f8fcb0c25941.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/kifoginumatesi-miminofobimor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f96d5749b05a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/calendar_girl_song_year.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/baby_girl_online_shops.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/myflorida_access_florida_my_account.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/scientific_method_spongebob_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 5816 bytes
SHA-256: 0297fc753449cf7ce0bd0b329394804b736bf003b1d12d0da50302c06f49f378
font_01_sfnt_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10612 bytes
SHA-256: acb39ad3b03304ec084a86755fc0d279d3136358283e4110970934fab695d1cc
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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