Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e6177aa836441a…

MALICIOUS

PDF

79.9 KB Created: 2021-04-04 00:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bab6e9106b1788e69ebb33fd114fe1ba SHA-1: e90bbd6683934ba13ae571931c8166f6db34a634 SHA-256: 85e6177aa836441a77df628269a6e1b13ed93a12bc0b6b04b28a3e4dcec1aedc
104 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'https://jottigo.ru/123?utm_term=vsphere+web+client+6.+7++free', which is likely used for phishing or to download a second-stage payload. The heuristic 'SE_URGENCY_LURE' suggests the document uses deceptive language to prompt user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/123?utm_term=vsphere+web+client+6.+7++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475212/normal_6049d87d0500c.pdfIn PDF document text
    • https://cdn.sqhk.co/gobejilu/8jjvjbq/tonozukikuronujoxoxaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fd16cde39c90.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/gjRhgZ3/woodworking_tools_gifts_for_him.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5fd9bac7ec824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f41473f-b16a-47ca-814f-ce913ae650ae/pisufifaxuzixepepib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c62423c-f2fd-448e-b26f-a142d05e561e/guardian_ad_litem_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce30436-dde9-4d38-b2cb-517aab307baa/ics_400_student_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84457e2c-f6b7-4fb3-ac1d-2ab0d1733172/rigekebunidepemajufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede798d3-1ac0-4635-9d78-e7a2a1223144/funny_maths_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbbba44d-de6c-4ba6-815b-b11a8b707bff/how_do_i_use_the_steam_clean_on_my_ge_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0dd6c46-8d70-49eb-9cd0-506138ee1064/2135226576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947cb0a7-2d90-489f-851e-72e35435d4c3/can_dapple_dachshunds_have_blue_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a7916e-3550-46e0-a68b-14c9c9d4e67d/junovewabazimafivejagal.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/58355058126.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/66980125606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea861102-be16-4f49-9e1c-afbd7a3d60a7/kafokufup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617fc035-7cdf-464a-9d15-193386a4a249/kenmore_mini_fridge_and_freezer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2018e28c-5429-4f30-b16e-4e49290aa82c/gazevaseguwemamuma.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 5356 bytes
SHA-256: f9e4f65eeb579e46d858fb5f557f09620d6dd5582eef7db8b3df9db55ca32a34
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 21464 bytes
SHA-256: 5e8da10b91caeb7d59191534046d93fe8817bb2274d9a27514d47048a755e2b3

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