Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a86d22f8b511492…

MALICIOUS

PDF

124.9 KB Created: 2021-02-26 08:38:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae29b5e14d0b3af06cd306768f3bb970 SHA-1: 86627df9cb9e08fd3029db513084d3435762dfce SHA-256: 4a86d22f8b51149200a80a07881695a8e0776a41bcb9540830f4add63769554c
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains external URIs pointing to potentially malicious domains. The presence of a 'download button' heuristic suggests a lure to trick the user into interacting with the document. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=carry+on+warrior+pdf PDF link annotation
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/fovedonutoze_sujogo_sumenixogo_wulinal.pdfIn PDF document text
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/popob.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/b8b45.pdfIn PDF document text
    • http://juvozukatug.66ghz.com/bob_ong_kapitan_sino.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/d596947b7954.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/36790856324.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/4915545.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/a1ab8c2429.pdfIn PDF document text
    • http://vofufime.mypressonline.com/how_much_does_a_life_coach_certification_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xezonijida/27439836242.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/xerox_workcentre_7845i_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/xefudirapejedukiwora.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/ultimate_diet_2.0.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/toxemoziwatejo.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/72355896776.pdfIn PDF document text
    • http://betoratawetaduk.rf.gd/on_button_click_submit_form_in_php.pdfIn PDF document text
    • http://basapixukeg.rf.gd/where_can_i_find_sat_practice_tests.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/modern_able_free_resume_templates.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_off0001b143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B143 4924 bytes
SHA-256: 32d23eab5461b6d2e3550c03c482c66ec0f82d784bd46c7ec3350c2de5b174d9
font_01_sfnt_off0001c22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C22C 10656 bytes
SHA-256: b001235b10e39a58e15162effe2a87e0658c30b8a0303304c8cb704d51e9d25d

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