Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5556a7f6946a29e…

MALICIOUS

PDF

79.6 KB Created: 2021-03-15 01:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f0757de5317ae611ed4de9a8e5be2f8 SHA-1: 23786651c21d995175bc707fe50262aa98d72895 SHA-256: e5556a7f6946a29e917fd8d1cfbf08dcec212d1c9fb0d4e4b7f3dd729e79d8f1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. ClamAV detection and ML classification further support its malicious nature. The embedded URLs and the document's structure suggest it's designed to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+does+black+ribbon+symbolize PDF link annotation
    • http://rm-swis-mine.com/36129175070wqc86.pdfIn PDF document text
    • http://damvglaz0.xyz/pisorofozafoxanimo5ld33.pdfIn PDF document text
    • http://makamar.xyz/nojatuwisomehlmz3.pdfIn PDF document text
    • http://ilkertr.shop/dipimumilegixivujifexbey4.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/26911515879fhhhy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_918b1c3861954606890cb44f81278abb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86aedcae-f8a8-481f-9603-3bb68e38d3c9/senobodogobikek.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/will_make_you_stronger_quotes.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/batuan_beku_jurnal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6811a2-4379-4fd1-b031-8ed67ed285ab/65331033202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2766dcdb-cc50-4f10-b7c9-a175a45321c5/fusugiko.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/kaluzevatax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1d971e-eeaa-44b8-b2c6-040b447df468/bizusasisofusewitukoz.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/husqvarna_sewing_machines_comparison_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873bd16b-6627-4142-b605-cbb87857ef08/vixumivolitabitoramur.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_cf96ff0ca66a4730ae60409af5856ecc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/messenger_apk_for_iphone_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3decc095-d3bf-4e53-8c67-073ae614f235/allen_carr_easy_way_to_stop_smoking_free_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6a2f2d-f04c-47f1-99f7-025ac771cebf/17273424754.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/zukagipefesokegotumuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/transmutation_wizard_5e_guide.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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 5548 bytes
SHA-256: 5f135ecab797ad4b670c3866b6b43645283c36b876e9b4762a0b76ad710577de
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 11428 bytes
SHA-256: 90bce685c8388b4583714bde5ca68b36fedba543b3b8019314a4120f6c557f2c