Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3696cfd6f5c8d2…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 13:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6889d8c9c65d4ac67f5fcb9fdc83837b SHA-1: 31685911ec40eb2a37c79852f731d3eeecaaea67 SHA-256: ad3696cfd6f5c8d266841d5da7d14140baae8eb881f269dbc8f29ded7a713c88
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://vilenefex.ru/strik?utm_term=physics+internal+assessment+ideas PDF link annotation
    • http://activa-fb.com/93235902420my08y.pdfIn PDF document text
    • https://wopuxikejixup.weebly.com/uploads/1/3/1/8/131856699/xefuno_kesuxadik.pdfIn PDF document text
    • http://astrohelp.space/acceptance_letter_hogwarts5ptmx.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/Ubshcif/ranitupasamowamil.pdfIn PDF document text
    • http://sandwichhq.club/what_order_do_diary_of_a_wimpy_kid_go_in4zgqh.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/4jjhgha/jibjab_hack_download_free_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/ggifyhg/backhanded_compliments_funny.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/1453523.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/827834.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/zemimozusojupesos.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/b5f240b5-da99-4eb8-8cc6-66c60d98a926/nikon_d5100_latest_price_in_philippines.pdfIn PDF document text
    • http://parapaxesu.rf.gd/jixaxovulopugusuvibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f113480-6862-4253-9774-efc7d10b70dc/firajakune.pdfIn PDF document text
    • http://joketatam.epizy.com/most_beautiful_nature_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d71e0a-6f8b-4bd2-b5b2-267ffcf57ad5/the_first_9_months_of_pregnancy.pdfIn PDF document text
    • http://fumebuz.rf.gd/best_feats_for_a_cleric_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73e5cb6-01d4-4f21-8ea7-7e86323e10d7/molecular_biology_genes_to_proteins_free_download.pdfIn PDF document text
    • http://lagunuriteg.rf.gd/age_and_academic_performance_of_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a0a281-b391-4eb9-89e1-cfcfeb74994a/final_fantasy_xiv_gameplay_pc_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03133dee-bdbe-462d-9018-e425a4b751ab/scotts_riding_lawn_mower_17hp_42_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba95d6c-3058-4668-be46-54562e9366e5/fixivebiluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e6f130-0912-4d1e-a574-49c91f3287cb/how_do_you_use_a_hoover_steamvac_silver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b0e8e9-c2b0-4d50-85ff-e2e1bf4175fa/bizolu.pdfIn PDF document text
    • http://wovovaj.rf.gd/javalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5b804d-b4f0-40d2-a061-daa4dcbdcca1/zmodo_app_not_working.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_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 5280 bytes
SHA-256: ef997b97b4fcea570ad316743050933e4558d2afabb3575a5f6d8a66fd1023d8
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 11352 bytes
SHA-256: 91cbe413dd58bba2ce02a2ba567b8b111b05460825ff35571cfb8da1c6d3ddf3