Malicious PDF — malware analysis report

Static analysis result for SHA-256 f914e3cf9c1079f6…

MALICIOUS

PDF

82.7 KB Created: 2021-03-18 18:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8e0091c5f60fd7980aeb43bb067e5905 SHA-1: 2f2c9c6160dd1b73bd20606ba5cf8ad1647f7d7c SHA-256: f914e3cf9c1079f6c2375c07e02b3d2ae607cdacb89e20e0d1286f2e31e2fa25
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary goal appears to be directing users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/award?keyword=calendar+2020+singapore+pdf+download PDF link annotation
    • http://majidadap.22web.org/translation_affine_transform_matlab.pdfIn PDF document text
    • http://gtmedis.com/how_to_reset_a1_service_code_honda_civicwqlb6.pdfIn PDF document text
    • https://bomekabekoz.weebly.com/uploads/1/3/4/8/134863976/juduwivavef_pofegijelefi.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/lebutar.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/98090296216.pdfIn PDF document text
    • http://spainsale.pro/balitijexigitqm9mt.pdfIn PDF document text
    • http://instup.xyz/screen_time_passcode_won_t_changesm6yf.pdfIn PDF document text
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/jujimezusel_lijemiwusa_disamap.pdfIn PDF document text
    • http://neuroncraft.online/odd_eyes_revolution_dragon_rotd9j4sl.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/catholic_encyclopedia_volume_4.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/viper_car_starter_instructions.pdfIn PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/dujonatilole_vevudanozukif_nomig.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/e85b2e101470c5.pdfIn PDF document text
    • http://kataeta.club/what_was_the_worst_day_in_the_stock_marketwfjsc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butazajoru.rf.gd/68129837138.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_66a3ba8a288c4c119d7507b240f21a80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5817c4-13b5-4c1f-a7c9-061d2efe3173/what_subject_is_human_geography.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_db5f1662ac5649a98b6325205ebe76df.pdf?index=trueIn PDF document text
    • http://konajif.epizy.com/calpers_health_forms.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8c9b15e6581f42a8880e3cdfd07dc621.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/842963d3-c5c3-48ea-a4b7-0335395282ac/lavad.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_34df77507cb04136b468fc9d2300df43.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_5e25137f15bb42729d2c6502f16588c1.pdf?index=trueIn PDF document text
    • http://gezewezelatemak.epizy.com/best_magazine_design_templates.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5480 bytes
SHA-256: 02cf3df74a135a3dce2cfbc4ed2759c9f9045c41822d65a7cd96174bf5670fcb
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10408 bytes
SHA-256: ce9721869a082acf20316479450756dbed2d8df7d754b01e457796cf2c14c3bc
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 16108 bytes
SHA-256: 97e80cc61ebbc6fe4ed03ffd5a5ae1d184ef07adb4204580ef84f3eb02720edc