Malicious PDF — malware analysis report

Static analysis result for SHA-256 c314d3325f2fa25c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-23 09:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7d8315ecbb4dd0e88f7e7e64d2b9e7c9 SHA-1: 7caf4ad785a45d440dbedbb99994f1c3752dfa52 SHA-256: c314d3325f2fa25cb148b27188da5059a9de216c8389a1aba32586cf09e80a4d
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were extracted, the presence of numerous URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious content.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=atlas+copco+compressor+error+codes PDF link annotation
    • https://cdn.sqhk.co/fapetemiji/Nyjyhhn/78601318054.pdfIn PDF document text
    • http://lurugusop.iblogger.org/clicker_garage_remote_keypad_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/iO7ueJg/photo_editor_background_change_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/f452Bqu/zakigavaponaneposevor.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/QAhewhb/11863898372.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/c6ji6FF/tauceti_vulkan_technology_benchmark_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/hdgfkgc/naraxavoguwili.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/dAzjdjd/learn_to_speak_fluent_english_free_video_course.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jjijcx2/d_virus_dance_academy_mandleshwar.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/iaYgg9j/14936488109.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/CohaEAC/dark_riders_marvel.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/the_dolls_house_by_katherine_mansfield_critical_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipowefata.epizy.com/74651720942.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/composite_materials_types_properties_and_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/catalogo_moviles_movistar.pdfIn PDF document text
    • http://mujunuge.rf.gd/android_phone_tracker_gmail.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/87646967166.pdfIn PDF document text
    • http://buwomonemagup.epizy.com/dividing_complex_numbers_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/guidesman_flashlight_website.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/csc_form_211_revised_2017.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_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 5208 bytes
SHA-256: 4209d9f32febc3059b6262497a072a7c32d6d8e2fc8ae1fb43c0f00abe33ca66
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 10248 bytes
SHA-256: 4fb17b97732a84beec33bb672e4ce0a777a5fe30241339564694d4223dc325e7

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