Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82a3b00f5db9ed0…

MALICIOUS

PDF

76.9 KB Created: 2021-02-11 14:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6238f94e301c6dd3057fbf507ba95512 SHA-1: 7f67f61f7a31a62d98759179903dfed08f76b4ea SHA-256: b82a3b00f5db9ed0fda1c769ad3e96f075bc674b5e3c846189f95ac24c71764a
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL points to 'crophysi.ru', which is flagged as malicious. The document body, though partially corrupted, contains text related to 'Rio salado class registration', suggesting a lure. The presence of embedded URLs and the nature of the detected threat indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://crophysi.ru/123?utm_term=rio+salado+class+registration In PDF document text
    • http://didopikorubozav.iblogger.org/green_day_american_idiot_live_mp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5fca5ad0b9dd7.pdfIn PDF document text
    • https://xapezojukigese.weebly.com/uploads/1/3/1/4/131453407/tasivinifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5ffa3cfa1a053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5ffacab44e25c.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/tedomovosexu-zepabu-wazoxeworoziziv-wugatupov.pdfIn PDF document text
    • http://fufodew.22web.org/lujesipopamujopizi.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/7984164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_5fd7310ab6a90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480162/normal_5fca2f43428a6.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://ketaxesam.epizy.com/76075950099.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/easy_geometry_problems_with_answers.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/woteku.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/77888587596.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/arangetra_velai_original_bgm.pdfIn PDF document text
    • http://jijabivu.epizy.com/52030270521.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/9685013713.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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 4900 bytes
SHA-256: 651a5842a5a78e63b5127e1dbe45e824944b1742f3930783238771462e45a224
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 11012 bytes
SHA-256: c81e46b442b91517a9a9af609c723702f4cd5910e369272a055615da2a7bb7f0
font_02_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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