Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a715736fa3123e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 00:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 654adfdfbc1dca6a1e6dfdeb383aa8a3 SHA-1: 21614c8f89b8defedbbe9be96f076f73afc15c11 SHA-256: e5a715736fa3123eb84552c5e5684c104442be3d4f2f87ed77e473ebcc6858db
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting an attempt to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=green+top+guidelines+ectopic+pregnancy PDF link annotation
    • https://cdn.sqhk.co/xifusajexom/Ilgcje8/mod_de_among_us_para_minecraft_java.pdfIn PDF document text
    • http://bioforcecolumbia.site/elkay_water_fountain_problems0meog.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/74e5d.pdfIn PDF document text
    • http://specrazreshenie.com/cheap_nail_shops_near_me_pricess7tmr.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/igaugiE/piggy_build_mode_update.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/UgdvjaB/political_compass_centrist_meme.pdfIn PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/lilujanizetez.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/mibjbyR/vukajerowitiromupuxedapiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/jhd3Aih/15104552434.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/hhyRQib/nhl_playoffs_2020_scoring_leaders.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/isoSjhc/36877668085.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/ifjbjcn/blade_ninja_star.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/fnKOEHA/huawei_health_custom_watch_faces.pdfIn PDF document text
    • http://trikolor.site/bass_tabs_birdland_weather_report9sp79.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/8ahgjgz/vigesefidalurinevobuxiwus.pdfIn PDF document text
    • http://ketotreno.buzz/place_value_tens_and_ones_grade_1byglb.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/fivig.pdfIn PDF document text
    • http://rivalo130.com/ibn_arabi_society_youtubeuz9dk.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/hc4ighn/spokane_teachers_credit_union_routing_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/139c6025-9016-47b4-98af-bac8a9b360a6/16470454869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305150a6-045f-4e78-99a2-f4f911fdf299/lozogaxobukonuxuvekekogu.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_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 5372 bytes
SHA-256: 070902a67893e0ba9322c38a26300b795efa35e03d727f2a5978049fb22e0c3e
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10580 bytes
SHA-256: d6694f2499b6a8926d9688f403cd84864662b14bf4701c4b5982e936f3f0b11a

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