Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ded11875525995c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-27 19:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 402a39b62bc2406c24a8794af75081f6 SHA-1: 6672a854f3e59ac0bd16459cc0e41afafa5b3dc4 SHA-256: 6ded11875525995cb1c675821d3913f3c6b722071ac34db7d7cd48cdc1690250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to sites hosting malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=starting+pay+for+starbucks+barista+california
    • https://mugunujepigujov.weebly.com/uploads/1/3/5/9/135992134/fogasen.pdf
    • http://phillipen.online/tipemitirwp64.pdf
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/3861829.pdf
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/9225946.pdf
    • http://usblighter24.site/how_much_does_a_9.9_hp_outboard_motor_weight74xcu.pdf
    • http://ygrash.website/beat_making_app_apkxj79t.pdf
    • http://marketop.club/mujidexoxanuruporoksnkg.pdf
    • https://sexaximelukifa.weebly.com/uploads/1/3/1/0/131069869/zelojun.pdf
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/1142079.pdf
    • http://noksipals.online/how_much_does_it_cost_to_rent_a_carpet_cleanerj3uji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dapekufoxiraku/coniugazione_del_verbo_accettare_in_forma_attiva.pdf
    • https://s3.amazonaws.com/remeranexe/tektronix_2445b_oscilloscope_service_manual.pdf
    • https://s3.amazonaws.com/lezerawe/mozilla_firefox_terbaru_2019_32_bit.pdf
    • https://s3.amazonaws.com/semuxemakaw/72123092619.pdf
    • https://s3.amazonaws.com/gupawupigawono/8204323627.pdf
    • https://s3.amazonaws.com/minabiwa/12652423036.pdf
    • https://uploads.strikinglycdn.com/files/990fe8fb-ce0b-4e4b-ae5c-83bca0f288f2/21864577235.pdf
    • https://s3.amazonaws.com/xukonakefules/xurib.pdf
    • https://uploads.strikinglycdn.com/files/0233e7cd-83ed-4035-a1ff-d5635ce9351f/can_dwarf_bunnies_live_alone.pdf
    • https://s3.amazonaws.com/bubisifapagefe/37403734054.pdf
    • https://uploads.strikinglycdn.com/files/a8f2e774-7fea-47e3-934d-ab5d89d28b39/how_to_paint_a_tree_trunk_with_acrylics.pdf
    • https://uploads.strikinglycdn.com/files/3df4c9db-81cd-473b-8ca9-45dd569e475b/what_are_powerful_fallen_destiny_2.pdf
    • https://s3.amazonaws.com/xufaxoferugod/17004723595.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f832.bin
a922fdd7cde9a3b21028a1c9e6daa9561646dcd358c78a1adc70b77678ab218f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 5592 bytes
font_01_sfnt_off00010b5b.bin
fc1dcc91b0011fa1d16909057da6be4a5a5ea74b8a5d42281c635b1c6df04fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 10756 bytes