Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7bbe1f5ea420e1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-12 18:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af873d0c4478cb3846edb42c4cea74c6 SHA-1: 37f3297db993ed62027b56a96609377d7c83bc4e SHA-256: fb7bbe1f5ea420e114cfd9906dcdd12c1149965555e17bb2ed98d576d20dcd81
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/aws?utm_term=red+harvester+ant+bite+symptoms PDF link annotation
    • https://cdn.sqhk.co/jezuleku/ijrHrGC/unacademy_learning_app.pdfIn PDF document text
    • http://iqecoportal.ru/kiwatepohp6sd.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/gcDidGR/lego_city_jungle_explorers_mobile_lab.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/84522.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/hhdjhjd/index_card_template_microsoft_word.pdfIn PDF document text
    • http://vipmanmarket.space/how_to_use_a_honda_gcv190_pressure_washerf2ell.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601f6527de984.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/PaXIpgg/photo_crop_tool_free_download.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/pilame.pdfIn PDF document text
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/95c0dbafe7862ed.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/vuwafesumud.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/tutorial_filezilla_server.pdfIn PDF document text
    • http://fujudigisegejeb.iblogger.org/health_economics_masters_programs_usa.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/terorosu.pdfIn PDF document text
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/ratozo_puwadosab_kanafokur_gojirinafixowor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_603fd8d46e152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_6037269a6340e.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/ajjjisl/dr._driving_apk_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://litorow.myartsonline.com/razor_e200s_scooter.pdfIn PDF document text
    • http://lewimidofi.epizy.com/bread_maker_cookbook.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/puwaxorafugatolominatek.pdfIn PDF document text
    • http://farapatenaru.rf.gd/avast_mobile_security_pro_apkpure.pdfIn PDF document text
    • http://befebepew.rf.gd/44629421029.pdfIn PDF document text
    • http://vipovanur.epizy.com/afterburn_aftershock_sylvia_day_ita.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5264 bytes
SHA-256: 75d6f0580e61556b611df09992e6e636f80e16bcd5cefb7070e14787aa87359c
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 10144 bytes
SHA-256: 5b2bc77f5fa510a169ac9b6e48d301b08e41ea6d6b97c0f9cc635a08247adebe
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2