Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2ebee6454df466…

MALICIOUS

PDF

86.0 KB Created: 2021-02-17 08:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 33892ad250dbb3c7b9168cc72190a96d SHA-1: 7cb5f23d32cc6a6fdf472fc536608d9816a6bd83 SHA-256: 2f2ebee6454df4660b921dcb37955b8f4e050310cae6006dfc30aedfeb946b4f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious or link-farming domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ClamAV detection and ML classifier further support its malicious nature. The primary malicious URL identified is https://yafferge.ru/strik?utm_term=what+is+a+law+school+personal+statement, which is likely used to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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/strik?utm_term=what+is+a+law+school+personal+statement In PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/5bdc0f8fa6c8cf1.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/532513dd79.pdfIn PDF document text
    • http://bedojipekasel.22web.org/appeal_letter_template_for_financial_aid.pdfIn PDF document text
    • https://tekagilodepini.weebly.com/uploads/1/3/0/8/130813992/kaxakakakame_pobofubodalobex.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/mozofep.pdfIn PDF document text
    • http://pijevovonojatev.iblogger.org/android_studio_3._5._1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuzowudip.rf.gd/barcelona_bus_turistic_map.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/bandish_movie_1980_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/commissioner_of_oaths_alberta_study_guide.pdfIn PDF document text
    • http://fijazuzid.rf.gd/green_tea_essence_mask_sheet_esfolio.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/24672826454.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/lapazibemolubegolep.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/charsequence_android_strings.pdfIn PDF document text
    • http://dinedolorexos.rf.gd/play_store_chrome_android.pdfIn PDF document text
    • http://melufisagaw.epizy.com/descargar_bluejacking_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/food_name_tags_template_free.pdfIn PDF document text
    • http://tutapijuw.rf.gd/mandatory_reporting_act_vic.pdfIn PDF document text
    • http://tetamupup.rf.gd/fegunimonadijix.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/service_improvement_plan_template_ppt.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_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 5276 bytes
SHA-256: 1573f2dd99bb24c3d6f3fad367ea3388cd7e23e5b748e163fb8e58bb0ee52eb7
font_01_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 2212 bytes
SHA-256: da6d78aabf2e0c131008e37c11e4029f2c1c73ee37dba6522cd96161b08373bb
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 10436 bytes
SHA-256: 370a3e436370ee60b355328ee47be2717ad18f633ff99ffc3ceb5aaa544c10ed