Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d04ccb573c60661…

MALICIOUS

PDF

76.4 KB Created: 2021-02-13 13:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f733f42d05679771e08d770ad0826c90 SHA-1: 37b6f89752ebcc45c98303b9a3d9ce9a7128a41c SHA-256: 1d04ccb573c606610c0f2353338bf6eb9c7f670e1af170bd78a3ed967d06605a
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URL `https://yafferge.ru/aws?utm_term=business+english+student%2527+s+book` is the primary indicator of a phishing or redirection attempt, likely designed to deliver a second-stage payload. While no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest an attempt to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/aws?utm_term=business+english+student%2527+s+book In PDF document text
    • http://wifefavowe.iblogger.org/formation_windev_20_iso.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/bhbjggc/10251015740.pdfIn PDF document text
    • http://rumajasajobotod.iblogger.org/latest_version_of_blackmart_alpha_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/yqJgehe/affinity_water_capital_funds_limited.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/geDRidF/brilliant_distinctions_coupon_50.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/0icNkib/91747107019.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/adgjvBB/76891452956.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/jaqkggE/94249058271.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
    • https://s3.amazonaws.com/gitipelut/klagte_brief_formaat.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/cdc_hep_a_vaccine_info_sheet.pdfIn PDF document text
    • http://dulibunaxojomo.rf.gd/major_organs_human_body_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/lobuwutepejozepekukibidon.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/budget_proposal_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/58086491129.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/36388077459.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/963542976.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/number_to_string_javascript_format.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_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 4948 bytes
SHA-256: e0f48698ae2ca6313569d87d3b4d9f9c20660c42f82eb9df21d2ba5556e5a4d8
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10184 bytes
SHA-256: 0928fd54ab40d9ef1621e83ee5d07c39c224b4125f7af0d5a15e7a3c098d88d6
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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