Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc86ea6331ab3548…

MALICIOUS

PDF

84.8 KB Created: 2021-05-01 07:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ddc350ff1123523ee80424d60ce3cf0a SHA-1: e859e32c909337c55cf5aa43d66d8227b17d934c SHA-256: bc86ea6331ab3548373af6962b6e14ddcae2ce12daa793b6e830a75444b29cbd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=the+100+book+4+summary PDF link annotation
    • https://cdn.sqhk.co/runudori/sia2giO/candy_christmas_2020.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/bangalore_city_pin_code_list.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/blood_of_elves_goodreads.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/rukitigoposixejijotuwak.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/wusiz-gimuwazidejop-begadamijenajus.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/jehjBjj/unicorn_color_by_number_games_for_free.pdfIn PDF document text
    • https://kajurizekevebok.weebly.com/uploads/1/3/4/5/134586758/7121221.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/nhj4hgC/93563929558.pdfIn PDF document text
    • https://pediralesozalos.weebly.com/uploads/1/3/4/5/134595574/315313c412172c.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/feveniweni.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/5942327.pdfIn PDF document text
    • http://venupalu.iblogger.org/30050771102.pdfIn PDF document text
    • http://linupobugilo.22web.org/tijotebafalifodebuk.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/hc4fgfg/game_forza_horizon_wallpapers_for_desktop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekurugakur.epizy.com/agenda_for_change_pay_scales_2020.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_ccb0ca22df3048f9947214fc61cf7606.pdf?index=trueIn PDF document text
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_b70609d246cd44c199592c6c3813af08.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4978bb161e384b6f8317e59a81e1c43b.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_d3cff598338447c79641969d724cf6c5.pdf?index=trueIn PDF document text
    • http://roporuti.onlinewebshop.net/xakezov.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_79997be5e1f343f6896fedbfa8dead52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c37eb8f-799e-4923-b118-4afe3dfa7ad2/cuentos_de_eva_luna_dos_palabras.pdfIn PDF document text
    • http://burevomekevi.rf.gd/mujonuwad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05925801-9d03-4c1e-9483-554f781f43c6/english_grammar_check_free_download.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_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 5428 bytes
SHA-256: 1dca71c53dc1913bc235b3e7efad0dc9d85b1af1cce261ce924c4c148053a6e0
font_01_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 11912 bytes
SHA-256: 8ef2a8e345a02d2a0b06dbe663f94938015fbca02cfa6d9de06990054402d529