Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ac02ecd70fe317…

MALICIOUS

PDF

74.3 KB Created: 2021-04-14 07:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6395e08339c54528418eeaacece6c1a SHA-1: 5e6e506a7afd00c4a1a7dff5347c4f8be7efc04f SHA-256: 37ac02ecd70fe3172689bea6ac48956e1b0a101e8998eb3aac30f5776d8f0ea9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://seumenha.ru/strik?utm_term=fundamentals+of+human+resource+management+5th+edition+test+bank+free`. The document's structure and embedded links suggest it is designed to lure victims to potentially malicious sites, likely for phishing or malware distribution, aligning with the characteristics of a phishing attachment.

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://seumenha.ru/strik?utm_term=fundamentals+of+human+resource+management+5th+edition+test+bank+free PDF link annotation
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/nozakisozidoxuni.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/xitvif9/nijakagelonozakagupe.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/CUhf0sQ/fexojulexa.pdfIn PDF document text
    • https://cdn.sqhk.co/pasudajuwesa/wJFggii/50285736866.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/17eaf08473b.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/hdghgjt/crowded_house_something_so_strong_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/cLX9ric/cheap_electric_guitar_for_sale_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/buwepexe/tDThi7E/world_economic_forum_2020_report.pdfIn PDF document text
    • https://rajomewebi.weebly.com/uploads/1/3/4/7/134712267/bevozefizenojib-vogiz-moxireju.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/wumilop.pdfIn PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/bafedisifizomu.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/hjtggA3/affirmed_networks_ipo_date.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/1321883.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/10e005ec-26d8-4290-89e0-f438213558f1/20199317666.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/list_of_useful_french_phrases_omniglot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aefe8b9-10ec-43ba-91bf-056272173d29/gunisiwazozi.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/putum.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/android_binder_thread_callback.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b60ba4-dfb9-473d-8604-99786a9e2299/vocabulary_workshop_level_d_unit_3_answers_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/73332908102.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/11229738879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241d346f-d618-494c-b167-b49e9e15e0d5/nakalabawabij.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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5716 bytes
SHA-256: 50bf7fe7caa4e2633bd81575215f2397505c84f7beabffb792df81e0dcff01f6
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 9988 bytes
SHA-256: a1dfe2800c42abd500c846198655be9cd5382de690f9eec99ae49e13989d1926