Malicious PDF — malware analysis report

Static analysis result for SHA-256 4522d71587ad98d7…

MALICIOUS

PDF

84.3 KB Created: 2021-03-22 14:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dfd1e78a08e950ec0207e5cdc905d2ac SHA-1: 900f7cf859a8e8ac2bb16ec6134c597bc3e7c2aa SHA-256: 4522d71587ad98d7083034f0de03a866a74a6ae9a9ca9076a791de3f73ed76c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9970

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=american+horizons+3rd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/ximegawaso/VjfifuM/benazala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_603163cc57b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6016e0001007c.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/common_words_in_english_used_in_daily_life_with_meaning.pdfIn PDF document text
    • https://nemimatavowep.weebly.com/uploads/1/3/4/6/134692492/9cea01ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/ggQjfhb/dirt_track_gladiators_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5fcded823d612.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/hijaZsF/gixavozukomorega.pdfIn PDF document text
    • http://lokutege.iblogger.org/kirloskar_centrifugal_pump_catalogue.pdfIn PDF document text
    • http://rubeatyshop.xyz/114529272390wowi.pdfIn PDF document text
    • http://closemaze.com/kexisunewasasumomifejaucuo5.pdfIn PDF document text
    • http://construt.site/minn_kota_i_pilot_link_remote_chargerx62bs.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/UYieZha/mini_golf_westminster_md.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/3196515.pdfIn PDF document text
    • https://xejuxomezul.weebly.com/uploads/1/3/1/6/131637030/vunalegojijawubavo.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/great_is_thy_faithfulness_orchestra.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/xadaminumubesuxeze.pdfIn PDF document text
    • http://btsworld.org/partituras_de_canciones_para_piano_facilesy7bur.pdfIn PDF document text
    • https://vakitepodedobi.weebly.com/uploads/1/3/5/9/135963574/7609147.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/iYicpJC/12706897984.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/arduino_red_board_projects.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womiwinimubejaw.rf.gd/inspirational_stories_in_telugu.pdfIn PDF document text
    • http://tobobuximalusu.epizy.com/21042139438.pdfIn PDF document text
    • http://nozaleb.rf.gd/86079802460.pdfIn PDF document text
    • http://kezasifofajimo.rf.gd/calpers_457_distribution_request_form.pdfIn PDF document text
    • http://loxupobupibim.atwebpages.com/the_object_primer_agile_model_driven_development_with_uml_2._0.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_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 5564 bytes
SHA-256: edcd528dac3a644694f332822201ad647379c9ac26e47ef1cf10d7ac04d73eb7
font_01_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 11148 bytes
SHA-256: c935ec703ae26add1b01e4d03ef88bca4c0726d2df756f95497ba1639a8391e2