Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccad73faf0b8096b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-30 01:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3450073feb47ea44076f3749dca8d5d7 SHA-1: 59826e253bcd0dfd43cb53f3f0ba5fdaacd062b8 SHA-256: ccad73faf0b8096b9800af19ae82518537dda655b99a4052a264b5f184478a20
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 0.9991

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://crophysi.ru/award?keyword=diferencias+entre+bienes+y+servicios+pdf PDF link annotation
    • http://repaircreditscore.info/xumikoxenuseporebusenar5sx3x.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/Ojdswpu/systolic_blood_pressure_definition_medical.pdfIn PDF document text
    • http://topijakalez.22web.org/barbie_girl_cooking_games_free.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/hidgjJJ/zombie_x_city_apocalypse.pdfIn PDF document text
    • http://naturebiolog.space/aws_glue_cloudformation_templatewo8qc.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/fjijqe5/91478836227.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/jnihjFk/php__server_remote_addr_1.pdfIn PDF document text
    • http://dkshlyap.ru/what_order_should_i_read_the_horus_heresy_booksgish5.pdfIn PDF document text
    • http://nexagufobutuf.22web.org/black_body_radiation_file.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/BYhgjjM/80810423415.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/DFrgimK/95253132598.pdfIn PDF document text
    • http://ehaberdevlet.com/bose_321_original_priceo6ll3.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/jjgjzK8/fejakufokuburojumumeme.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/bhjcjiY/chest_workout_at_home_videos.pdfIn PDF document text
    • http://markettop.pro/handwriting_analysis_test_online_free8jziy.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/dtxhhFO/dj_marshmello_songs.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/dojivewobasuval/51665115909.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/whale_smartbail_manual_bilge_pump.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_5f32219c643e436dbc28d87967039eec.pdf?index=trueIn PDF document text
    • http://febejesibek.rf.gd/danasevulamumizidolizibu.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_20fe91c4aac744678b404e596f458a17.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_078d1dc78384492682fd87ed6eaebef6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/virginia_concealed_carry_permit_renewal_form.pdfIn PDF document text
    • http://xenikezoteboze.rf.gd/riwijapekazajukevefajud.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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5420 bytes
SHA-256: 50fce0eee950cc0d5365ef9a134bb89320803a23aae69ddca209d2f913493a15
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 11368 bytes
SHA-256: 5a5121ccc15bb6eab94935c8be3880d760940adecbe1cde6e0e8d4fa10a81299