Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef9447943bf2d20…

MALICIOUS

PDF

71.1 KB Created: 2021-02-14 23:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2fa4db66fe0c704184508018c0aa915 SHA-1: 0035901548f8252799c6206b11ff5c4649a08d54 SHA-256: 7ef9447943bf2d205fe6b936a13cbab46b1441084eb1623c270c4e09df10be46
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/wix?keyword=introduction+to+probability+and+statistics+answer+key'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL and the nature of the lure suggest a phishing attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/wix?keyword=introduction+to+probability+and+statistics+answer+key In PDF document text
    • http://kepovimobezozo.iblogger.org/child_custody_declaration_letter_template.pdfIn PDF document text
    • http://wakekuluma.iblogger.org/tuwujulevorera.pdfIn PDF document text
    • http://jurofenopoxu.iblogger.org/sinijuroxadula.pdfIn PDF document text
    • http://sun-italy.space/wabawe0w365.pdfIn PDF document text
    • http://zunejabilake.22web.org/13542002628.pdfIn PDF document text
    • http://glawerry.online/tebuvuxerukuzavepovilpi2b.pdfIn PDF document text
    • http://makamar.online/the_magician_s_elephant_guided_reading_levelbo3fm.pdfIn PDF document text
    • http://itdiscount.info/inside_out_festival_2020sl6sj.pdfIn PDF document text
    • http://vabakavolageni.22web.org/netbeans_java_web_application_plugin.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/78672787885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vagilamiporaw.epizy.com/collection_agent_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/fekilobebodinosanisigunu.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/pradhan_mantri_awas_yojana_loan_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/noven_belleza_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/app_store_not_ing_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/best_answer_for_are_you_in_love.pdfIn PDF document text
    • http://resaruxowepu.epizy.com/59389641729.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/encyclopaedia_of_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/livexo.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/iracing_car_setup_guide.pdfIn PDF document text
    • http://vixezazemezox.epizy.com/78041241412.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/adobe_audition_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/nice_guidelines_anxiety_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/biblia_reina_valera_plenitud.pdfIn PDF document text
    • http://rizibapuzaduxe.epizy.com/blitz_buggy_racing_mod_apk.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5400 bytes
SHA-256: 526ac6070479538336dad113fff93c588a6363d2abf137895fee0b1f00f3ac3a
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10200 bytes
SHA-256: f2ab33b78665585bc483c31906c57a28d2618d3a193c7b103e38518bde3967bf

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