Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e580057320bb9f8…

MALICIOUS

PDF

72.6 KB Created: 2021-01-25 14:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67426322bc3a62adc944de071d2ec4b SHA-1: 8f8bd1f1d52d399117f7c1fde712c5ab29a07935 SHA-256: 5e580057320bb9f8580a5c66022c64b3cade71b0f83a8c8006164e79ca208914
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, which is a common tactic for distributing malware or directing users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=ain%2527t+no+man+lyrics+angaleena+presley
    • https://gelixilononusi.weebly.com/uploads/1/3/0/7/130775878/pidutovabutisuzita.pdf
    • https://cdn.sqhk.co/wazofovam/haAzTCt/blockchain_technology_applications_in_power_distribution_systems.pdf
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/70dd0e1e.pdf
    • https://cdn.sqhk.co/wubunepan/aWWS7yd/siwogimazudavewekom.pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/0ba4f878.pdf
    • https://cdn.sqhk.co/remimidotomi/agcJTrV/arcade_games_for_home.pdf
    • https://cdn.sqhk.co/tozegatopaxu/3tYbEhh/34627527493.pdf
    • https://cdn.sqhk.co/mudaxomemut/gdhdj2t/toddler_twin_bed_sheets.pdf
    • https://nukubutanedun.weebly.com/uploads/1/3/5/3/135309192/6081877.pdf
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/zoburozim_sowumateroj_gilizuwija.pdf
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/kebedopavewadaden.pdf
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/4471797.pdf
    • https://cdn.sqhk.co/nomazotesi/fgeSjaP/digestive_enzymes_side_effects_pancreatitis.pdf
    • https://cdn.sqhk.co/vebiziwob/3jhvjdl/king_s_throne_game_of_lust_heroic_maidens.pdf
    • https://zofekumu.weebly.com/uploads/1/3/4/7/134741387/8398141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pivetuzadujo/medical_laboratory_manual_book.pdf
    • https://s3.amazonaws.com/sesijesule/1566886087.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_off0000ddd8.bin
107ee408fdca478cf7d736d855d01e78baa337ea2c475d72f98018a289be7000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 5380 bytes
font_01_sfnt_off0000f01f.bin
d11077a92ac07e99fe0044a778c934473e4eebfe1d33db6754f04c3c81021101		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10824 bytes

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