Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea38b7ff7a2a1621…

MALICIOUS

PDF

70.0 KB Created: 2021-05-11 23:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 655b21daafd7ce4526a5cf3ea369a6a3 SHA-1: a06eda57c7d1ccbc8e8ea9d8a25f5978744d8701 SHA-256: ea38b7ff7a2a1621acb9d6d0456389878bc7c97729e27489eb3b8a098ac53d7d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=grundfos+mq3+45+b+repair PDF link annotation
    • https://wasitenatibasi.weebly.com/uploads/1/3/4/8/134890771/pipabuloxevu_fajusa_kufosaz_xilijevijuze.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/cXS0She/carnivores_ice_age_pro_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/yNhbkji/chinese_fishing_reels_wholesale.pdfIn PDF document text
    • http://moitender.org/adventureland_tickets_veridian31m20.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ichbjcm/data_roaming_is_turned_off_message.pdfIn PDF document text
    • http://meetsol.xyz/diastolic_dysfunction_with_echo_new_guidelines_2016ia4bv.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/vgjajaz/22849713000.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/kejup.pdfIn PDF document text
    • http://snt-br.ru/used_sat_books_for_sale5h6ch.pdfIn PDF document text
    • http://litetederus.22web.org/les_analyses_biologiques_du_sang.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/293e9994-18bc-4155-8d5d-4edbe87ece38/how_to_deal_with_being_sad_all_the_time.pdfIn PDF document text
    • http://fobifuv.epizy.com/electron_configuration_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35576cad-ac5e-4f23-bd17-14b6e4bdea45/what_oil_for_honda_eu3000is.pdfIn PDF document text
    • http://bilunet.rf.gd/dopatixovim.pdfIn PDF document text
    • http://vevenamefod.epizy.com/competency_based_interview_questions_and_answers_for_hr_administrator.pdfIn PDF document text
    • http://lenidifumejuvig.rf.gd/arkham_origins_patch_pc.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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 5828 bytes
SHA-256: 22fa228e6f21b86166c495a4c33e6dd893c2c2908cc378f73f1a879093781908
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 10712 bytes
SHA-256: f7325b899bf42cffbe20308bfe9d3d826330631daf288c9b427fbaa8c53c9301

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