Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c89ab3c39db2c1…

MALICIOUS

PDF

85.2 KB Created: 2021-04-12 02:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ac6ebbe85a26f9ada47e2b7da81497d3 SHA-1: 80142de158d31c0240e120ef7fd861b9135c2414 SHA-256: 31c89ab3c39db2c145aef8af03d813bad6e17b9d9f107282957aa50dbe078ec4
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host many links, likely to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://druttle.ru/strik?utm_term=guitar+chords+for+hindi+songs PDF link annotation
    • http://lorenbayi.com/864246236862fg55.pdfIn PDF document text
    • http://urolog.xyz/jesus_calling_free_download5zjak.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/48014017222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_604ca4fbc2f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_600592008f08d.pdfIn PDF document text
    • http://priz24.site/como_crear_un_desde_el_iphonef491b.pdfIn PDF document text
    • http://axacheat4.xyz/disneyland_park_map_2020im0hn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_606a8a85b7de2.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/how_to_use_insulin_pen_needlehsgbu.pdfIn PDF document text
    • http://roskycnmx.com/59971860572n3n6p.pdfIn PDF document text
    • http://autoupgrade.website/10897834091lv0eb.pdfIn PDF document text
    • http://citimart.online/entrepreneur_s_guide_to_customer_development92aai.pdfIn PDF document text
    • http://wiinorama.space/hyperdimension_neptunia_re_birth1_lily_rank_guides6pzt.pdfIn PDF document text
    • http://zesivez.iblogger.org/chet_atkins_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_606b7d3f17c0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2928861f-5aaa-4c41-a3fa-5016ef6ce946/saxuwidaxudozibuvufa.pdfIn PDF document text
    • http://midowuvebadol.rf.gd/interest_calculation_in_excel.pdfIn PDF document text
    • http://wijinap.rf.gd/eclipse_debug_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1a6bd8-2353-4592-b2cb-2002f7d4547c/especializacion_en_derecho_procesal_civil_en_medellin.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_51b391222c674d08aa884cccdd3461d4.pdf?index=trueIn PDF document text
    • http://wifotuzo.rf.gd/79235271978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c7c2a8-5968-49dc-95f1-460ea3702f1c/twilight_saga_new_moon_free_full_movie_online.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_3e9f956f4ad84958be6d5db815e85722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43267571-01e4-43ad-bd9c-5f3ddb626352/68415051465.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_48cf4eb2240a478b87005d35f47d206b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c93f64b-ee77-47c4-ad4f-5832fbdf1af4/como_se_hace_un_bosquejo.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_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 5284 bytes
SHA-256: fcb657b3a611e30a5b20718ccdf42e3e53fe66e4852165c504bc0f77aa31443a
font_01_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 11224 bytes
SHA-256: 48b8fff61a4f54552060c18bac4e60651aadeab24bbd5fc96de78f57a2f19b61