Malicious PDF — malware analysis report

Static analysis result for SHA-256 526d7723a782b1e9…

MALICIOUS

PDF

88.4 KB Created: 2021-01-16 01:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06a145d6f9484047cece0436af3487fc SHA-1: d23dd7b88ea96823497042fe72e872d5a5e67231 SHA-256: 526d7723a782b1e9836840580773185dcc64b98617b9c514a21aecbb88f642cf
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link to a known malicious redirector and the sheer volume of PDF links suggest an attempt to distribute malware or engage in phishing, likely via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=lavish+suramar+feast+rank+2
    • https://site-1171487.mozfiles.com/files/1171487/adobe_photoshop_pc_64_bit.pdf
    • https://cdn.sqhk.co/rosomugimo/iiN1hhd/stickman_fighter_shadow_warriors_mod_apk.pdf
    • https://site-1168030.mozfiles.com/files/1168030/hit_the_roof_speed_gang.pdf
    • https://site-1179443.mozfiles.com/files/1179443/korodowoduwinevuwe.pdf
    • https://cdn.sqhk.co/siwuvulutip/ggjRidV/65314638516.pdf
    • https://site-1178084.mozfiles.com/files/1178084/cisco_networking_academy_chapter_12_exam_answers.pdf
    • https://dizodedijep.weebly.com/uploads/1/3/5/3/135391654/mabazepekuk_bagunosizawad.pdf
    • https://site-1228018.mozfiles.com/files/1228018/smallest_android_phones_2017.pdf
    • https://site-1167993.mozfiles.com/files/1167993/wobixutivazur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nevovumowa/windows_form_application_sample.pdf
    • https://s3.amazonaws.com/minabiwa/13_colonies_worksheet.pdf
    • https://s3.amazonaws.com/wozowuledij/legume_research_journal_author_guidelines.pdf
    • https://s3.amazonaws.com/zeworibuzoza/61269246973.pdf
    • https://s3.amazonaws.com/fosagoba/533493842.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/aside_scheme_full_form.pdf
    • https://s3.amazonaws.com/kumasala/armitron_watch_manual_45_7041.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d87.bin
8592224cb4fd6d092e81a2bed8ccc85dd9ab21e1d291ec928484fd40829b171d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 5172 bytes
font_01_sfnt_off00012f00.bin
a7bc71433eefc54311cf1fd4634250ada02164e78b86a813ac3948c4ffd49c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 11348 bytes

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