Malicious PDF — malware analysis report

Static analysis result for SHA-256 c812d9ed95cba02f…

MALICIOUS

PDF

78.6 KB Created: 2021-05-02 09:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e8c6b66cc095d1e628cdf15ded6920c1 SHA-1: 9f4f58a2b26c6d6c956029314cde74370dc2fbfd SHA-256: c812d9ed95cba02f937cc35dd27b8c67a63c1eab87f0bd6d93c2e139f405e0e9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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.
  • 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://dugedepap.ru/strik?utm_term=intro+to+trig+worksheet PDF link annotation
    • https://dojapoxozali.weebly.com/uploads/1/3/0/7/130775013/bbb1ddc5ea.pdfIn PDF document text
    • http://nawilojobate.iblogger.org/41629307515.pdfIn PDF document text
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/9e191ccd37955d6.pdfIn PDF document text
    • https://wivevesatowot.weebly.com/uploads/1/3/0/8/130813399/bed84e363270d41.pdfIn PDF document text
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/gegisamuwemuvuk_banebamat.pdfIn PDF document text
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/bavutazamidu-jakedopasi-mabebu-mexelebigepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_1a9245239399434d81b4ffb1776994c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/persuasive_essay_examples_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/nisivolilovazogevevasa.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_90cf4941154a4321a8e2a58aab21556a.pdf?index=trueIn PDF document text
    • http://merefasi.rf.gd/english_spoken_audio_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda4c37e-c8fa-4e2a-84f4-6f7bbe0e96de/zogeredavojiluguvesukorev.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/at_least_i_look_cool_song.pdfIn PDF document text
    • http://veduredetud.epizy.com/programme_triangle_pascal_python_recursion.pdfIn PDF document text
    • http://wodefelid.rf.gd/mpdf_border_radius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd04f2aa-5ec5-4386-ba13-fcb63c4095b8/dilarofebef.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_43178cb7c0354391b44ab417d78f8013.pdf?index=trueIn PDF document text
    • http://nowuvilopenibe.rf.gd/merkur_safety_razor_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119a5d6f-51a8-4f1e-86fe-143d30793b67/how_to_forgive_a_person_who_isnt_sorry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9904796-8d9a-439f-acce-bd448a87d3c6/how_much_weight_allowed_in_carry_on_luggage.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/7481108393.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 4588 bytes
SHA-256: c8e21f9763984f447c269999c873a874df5d241737c7a8417f9aaa9ca6c8bdf3
font_01_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 11592 bytes
SHA-256: 30709cf51f7851ddf88f10942ac14aab0ea8439a1804be9678e91b7be8355fc0
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e