Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e6782c5d2e1532…

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 07:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ac9b04991c5fa0b0c7b5d8092f46cc15 SHA-1: c306c5e8b341e06f94def9d8e587cd5103979ae5 SHA-256: e5e6782c5d2e1532c3b307e6f8f22815e189cfce2a93da3b1f01c4ed80f860ac
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is directly referenced in the heuristic findings, suggesting it is used to deliver a malicious payload. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/award?keyword=anna+and+elsa+coloring+pages+pdf PDF link annotation
    • http://begetus11ppz.xyz/how_to_do_calligraphy_on_procreateick0z.pdfIn PDF document text
    • http://nesobaka9.xyz/si_no_te_gusta_como_soy_ya_tengo_a_d0pygo.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/eiffghx/rakaralabasalobaxozaf.pdfIn PDF document text
    • http://clubstore.pro/3291575847la75s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fdeca136a631.pdfIn PDF document text
    • http://izzzaaa.space/strategic_management_human_resources_definitionta964.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/5qbBjcV/kamiririzuvisupan.pdfIn PDF document text
    • http://mivetys.xyz/popsicle_stick_catapult9q6x5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387808/normal_600997528083a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5fdf00647b007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_602543c29e21f.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/CMjdhcl/37040198180.pdfIn PDF document text
    • http://argo-tourism.com/enemy_pie_book_theme4d03p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_603d920579b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_605ee3bd112cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_601e97e1405c3.pdfIn PDF document text
    • http://dom-bita.org/brian_decosta_workouty2gmw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5fc95f130e408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fc661dc8c1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/thbjj0l/95731182668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5feecb20d3f51.pdfIn PDF document text
    • http://chambrehq.xyz/9280705079m2m51.pdfIn PDF document text
    • http://labincom-med.ru/what_is_the_focus_of_biological_psychologyjojlu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_600e13a553cf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 5312 bytes
SHA-256: fa3bcd3e3bf7aea431fe185cb0729cc2e9e54c9dcb77beac024a067d5bf14d8f
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10620 bytes
SHA-256: 125a5bc479ed6e81e61a0e64ca9175b37573a7a8f6799ab352bcb18672c4fee3

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