Malicious PDF — malware analysis report

Static analysis result for SHA-256 579e2d19c546b373…

MALICIOUS

PDF

66.6 KB Created: 2021-03-14 06:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa26c141fa46ec4fd03c7f8cfd6bd533 SHA-1: fd22a93f1555f46d5065978b3e678ce4ab7f5311 SHA-256: 579e2d19c546b373e2ce94edfd2b8dab38d7c585c932b1b64d7726fe0808ac00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of external URIs and a link farm suggests an attempt to redirect the user to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a lure to trick the user into downloading something, likely malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=penguin+readers+level+4+pdf+free PDF link annotation
    • https://cdn.sqhk.co/sejejajoxej/GgcjfbT/mobile_recharge_offers_today_idea.pdfIn PDF document text
    • http://badamow.iblogger.org/ielts_writing_vocabulary_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zavufepugife/ibiawfU/fesofilevik.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hgpIVnQ/84076432039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwelaloz.epizy.com/penyakit_arteri_koroner.pdfIn PDF document text
    • http://xovijoj.epizy.com/gerbera_daisy_flower_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca91159-c917-4e7b-880c-81e95f769c14/14560511883.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/artificial_intelligence_and_the_future_of_accounting.pdfIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_8c01d84ab47a42cbba90f0abfb1656f4.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_65bb0700ade841ef9764e4fdc5798be6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/luigi_s_mansion_3_gem_guide_b2f.pdfIn PDF document text
    • http://wuluveviwibe.epizy.com/5485142885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3f1972-3bed-4463-91bf-96257637c43a/bosch_silence_plus_44_dba_water_not_draining.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/husqvarna_yth18542_reviews.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_0bdc47bfee464428a2ba6bcab2ee80d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/doxitinovivonuropunidoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304c7f05-64ed-491c-9252-c0f98be61367/visiterasavokali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7b9e9e-fdfc-4195-8b16-9509b0eb04d6/jude_the_obscure_free_download.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_3d53d9aeee1f4bff84bc7ffddf924a5d.pdf?index=trueIn 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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 5360 bytes
SHA-256: 7084ef92137c80dcb880c44a0e9ba76d9e588c5f0f85f434497db63d684b4618
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 10128 bytes
SHA-256: a94ef0be2b8484bf543c6b956d0dfa5d9944fad01614afeb2c185565742f5a43

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