Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9387211ea4436b…

MALICIOUS

PDF

97.3 KB Created: 2021-03-15 23:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afea1ea837f4f3221e9a68408149e712 SHA-1: 2f80df7e02297753e084575f1d58445f9f67e708 SHA-256: ba9387211ea4436ba619b02f42ea435ede020e60d096d24468bf6d117cdf421e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a fake CAPTCHA prompt. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://dafemum.ru/wix?keyword=chapter+14+the+great+depression+begins+building+vocabulary+answers, which is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://dafemum.ru/wix?keyword=chapter+14+the+great+depression+begins+building+vocabulary+answers
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5fd39bff26e36.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_602aba93095a9.pdf
    • http://mubalupuzapo.22web.org/xavadifet.pdf
    • http://milawigigobo.iblogger.org/sears_catalog_homes_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4368471/normal_603838b517140.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lezerawe/wuzogirapodofa.pdf
    • https://uploads.strikinglycdn.com/files/5a0d0339-c4ac-4934-9869-76b680586f0e/saxon_math_intermediate_4_workbook.pdf
    • http://mivajodeki.epizy.com/pijawososilakokuxemojeja.pdf
    • http://titizobilane.epizy.com/38843496491.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_fd7042195353458d939a06c89c17a7c5.pdf?index=true
    • https://s3.amazonaws.com/xijalovelokolep/45223360989.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/36773098135.pdf
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_939baaa5a6264501ad8e08b301d73d73.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/73510579355.pdf
    • http://xafonabikox.rf.gd/51041460641.pdf
    • https://uploads.strikinglycdn.com/files/26da01b8-4904-41bc-91c3-e4c7483561e9/diablo_2_assassin_weapon_runewords.pdf
    • https://s3.amazonaws.com/lonozote/vokajibuziwiperolami.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ea1.bin
eee002097caa6d6c589de78bd3e4cc3781ebc5c93c63ca0d2fd5cde262c3f0c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 5776 bytes
font_01_sfnt_off00014266.bin
435be59420b38ab9cafc8eedc4281c9792f57948f3c5df5a580f4f3ae894e7ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 11496 bytes
font_02_sfnt_off00016982.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16982 4324 bytes

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