Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cf88df78f95007…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 12:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55b5c1d19bdc7e1733443c0b9234878 SHA-1: ddffbf3f115309860cf8b929cc1a706f32aa81b8 SHA-256: 52cf88df78f95007f7e04e32f5f8c9424f6ed7313f06f9ba9eed72bddcdd842d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous external links, including one to 'golowaki.ru', suggesting it's part of a link farm or phishing campaign. The document body is heavily corrupted, but the presence of external links and the heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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://golowaki.ru/wix?keyword=write+source+skills+book+grade+8+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_6037f97c179bf.pdf
    • https://cdn-cms.f-static.net/uploads/4422148/normal_605272adc9dbd.pdf
    • https://cdn-cms.f-static.net/uploads/4387566/normal_6019a1a000879.pdf
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5ffb7f217d10d.pdf
    • https://pixufudevolu.weebly.com/uploads/1/3/0/8/130814466/9049542.pdf
    • http://deviditiposu.iblogger.org/what_kind_of_pasta_is_used_in_minestrone_soup.pdf
    • https://cdn-cms.f-static.net/uploads/4411493/normal_6028667ec7e6c.pdf
    • https://cdn-cms.f-static.net/uploads/4420451/normal_602f92bb84769.pdf
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/vitukefuwukel.pdf
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/4108547.pdf
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5ff49f507f6e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://darelarara.epizy.com/nelizuxute.pdf
    • https://uploads.strikinglycdn.com/files/3a16caa9-0a82-4f49-a4c9-724b8f6b9344/what_is_the_best_chinese_dirt_bike_brand.pdf
    • https://uploads.strikinglycdn.com/files/22a93ed9-bae0-4167-b452-4ae9c4ec626f/76120487589.pdf
    • https://uploads.strikinglycdn.com/files/c49a8771-18f9-48a8-a324-5de1a821a51e/best_r_book_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e80143a4-8d3e-46f9-aa62-6a82c7980944/68518038337.pdf
    • https://uploads.strikinglycdn.com/files/e45a965b-65d2-4425-8478-979872dd23ac/what_does_it_mean_when_all_your_dashboard_lights_come_on.pdf
    • https://uploads.strikinglycdn.com/files/17b99d71-3123-499e-a626-07d9cdb5ec54/pearson_chemistry_textbook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7b.bin
3cdf88c8b4c8a615b77db9a155ef1534a226fe1f90195ad80a3d81716a9753af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5824 bytes
font_01_sfnt_off0001007a.bin
7bc2c7c4aa856c11c6e0cf382a402e67c058b97a9b8918dc889a6672f20f9dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 10260 bytes

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