Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5727f995161039…

MALICIOUS

PDF

70.3 KB Created: 2020-12-23 17:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca97012eadcceecd78d9c79eb80f39d SHA-1: 7e133972286f8e519ec2105c962dc582167cc457 SHA-256: 7b5727f9951610393182897ff3b635cec5b13d909ae215d2b5657f1197bfb372
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The presence of a large number of external PDF links suggests a link farm designed to lure victims to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/123?utm_term=6-6+analyzing+graphs+of+quadratic+functions+answers
    • https://cdn.sqhk.co/lizupasepafu/Tjhjchc/35258959895.pdf
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/nemapigazus.pdf
    • https://cdn.sqhk.co/zexukobesu/hj8Viab/41471577965.pdf
    • https://cdn.sqhk.co/navififoro/DVOZajj/undeniable_meaning_in_punjabi.pdf
    • https://cdn.sqhk.co/forokuxodel/HsaB7jh/cancel_bet_plus_subscription_iphone.pdf
    • https://cdn.sqhk.co/fojoravuvu/ahjgdYy/menona.pdf
    • https://cdn.sqhk.co/kapudome/hcihikX/r_type_dimensions_pc_trainer.pdf
    • https://cdn.sqhk.co/niturunajik/27Ygegf/loopnet_nj_for_sale.pdf
    • https://cdn.sqhk.co/risevejuxik/cgdjdbQ/rolling_stones_songs_with_color_in_title.pdf
    • https://cdn.sqhk.co/xaderimi/bjcIhcz/36038687450.pdf
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/rojoga-mipenozeni-faridelafelu-dagenenedo.pdf
    • https://cdn.sqhk.co/nezafomura/RDnG35s/f_stop_gallery_pro_paid_apk.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/760b1b01-7813-4887-8029-d5757268ddd5/91779886051.pdf
    • https://uploads.strikinglycdn.com/files/9fb48ad9-e911-417f-a861-43f03a717c37/minecraft_pe_1.0.9_apk.pdf
    • https://uploads.strikinglycdn.com/files/687abd95-55bd-4cdd-8489-a1170266b893/dog_muzzle_petsmart_canada.pdf
    • https://uploads.strikinglycdn.com/files/5156ee6b-3b18-4c33-99dd-f80a21ca4186/agario_mod_games.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca47.bin
1a0be974906210d4428c741e1f6e48a8f0bd6e4353cf9bb243ada8bba2887625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 1660 bytes
font_01_sfnt_off0000d28a.bin
6a45a1c40d0310d3226feca5f7023caecbe20ad92387e35466adf1924674d83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 5876 bytes
font_02_sfnt_off0000e6a7.bin
26fa2aadaa9a67c7119b0d7ebb0439f3fa94a969ceb119391f4c778a8ebe72e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 11096 bytes

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