Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e7ca10db36217b…

MALICIOUS

PDF

74.2 KB Created: 2021-05-14 15:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ad10e16ea9d4f858f227a8b4700635f SHA-1: c6afdeab48e7074f4611602b5e74b3e4d684ca15 SHA-256: 66e7ca10db36217bd759c15b3686ca0e6ddccaa432e3168f949931e549b2821d
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 0.9993

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://jumiwimov.ru/strik?utm_term=youtube+50+ways+to+leave+your+lover+drums PDF link annotation
    • https://cdn.sqhk.co/gowomawabude/hcElkjc/dead_purge_outbreak_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/rqijmn6/idle_gun_merge_and_shoot_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/PjfjgP9/saudade_definition_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/thjjfLZ/night_killer_trailer_1990.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/86652517606.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/kbPPhcV/goxapigoxobinibir.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/bilateral_aid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_5fe76ae8c3a21.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/20fafd33b0.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/3fb58ccd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_600b4071edafd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fce5b98a3d82.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/veintiocho_creencias_adventistas_del_septimo_dia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/fresh_off_the_boat_season_3_episode_7_the_office_tv_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59147420-7df1-4358-866e-0cc411b00614/how_much_do_adobe_illustrator_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e47eb9-d5fc-4f30-a265-c99755f045ce/calligraphy_lessons_chicago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144cc367-6d64-481d-a6ef-5d1813e4b796/79792062426.pdfIn PDF document text
    • http://pupowelepidojek.onlinewebshop.net/nixaviriruguxurawewe.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/relewefoxabumasosomaxagim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3e7d5f-52f6-4ccd-8895-7f286eaf773c/vuxugejol.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/what_satellites_do_dish_network_use.pdfIn PDF document text
    • http://tirigofov.atwebpages.com/gugebubamewunivuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bff30c-6756-4930-af85-7f9b54155dad/how_to_update_kindle_touch_4th_generation.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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 5592 bytes
SHA-256: cea6a1226390c7a07a827a7da4c067d392d683cb3821603fba969aab17575ece
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 10744 bytes
SHA-256: 49ff413beac0007443dfb83b80f623cfd12b5261c4f535ed69fff54b612ac97c