Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cca791da1570e4…

MALICIOUS

PDF

90.5 KB Created: 2021-02-04 22:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 707e430c0a0a6849918d879f978683ae SHA-1: b813dd892813b1008f002f68d42d5aee75db66b9 SHA-256: f5cca791da1570e4b76bdcb3d59e834d72782cb19f77d0b063dceedc09bec6ad
96 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 a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text suggesting it is a 'unit test answers' document, likely a lure. It contains an embedded URI pointing to 'bologen.ru', which is highly suspicious and likely serves as the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=say+it+with+symbols+unit+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450438/normal_600aee3ea613e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5fe84b29452d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fe32ddda1709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5ffc539c8e920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451217/normal_5ff3935443718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5ff86b105cc49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60151e33151eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_600641e76bc9a.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/rolidoreximi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_5fea02bfe5800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_5fda6952a18b3.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
    • http://sakigekoxigukil.epizy.com/jamapeselojilar.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/75515039943.pdfIn PDF document text
    • http://sonazorapabame.epizy.com/abraham_twerski_books.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/36890028316.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/behind_closed_doors_hbo.pdfIn PDF document text
    • http://bexatati.epizy.com/22949305481.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/epilepsy_action_australia_annual_report.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_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 5244 bytes
SHA-256: c06482790337fb6f5eb374b014260d3a992162efe361330511f04724f50b3988
font_01_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 11992 bytes
SHA-256: ee5378bb6d5ad8a4ea4d28bee30955b1b735c0e58ac861be5514f04c98cb940c
font_02_sfnt_off00014e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E56 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.