Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b7a550ab4da334…

MALICIOUS

PDF

70.9 KB Created: 2021-03-17 10:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2aa593df1d26bfacceaa88b727e3d7a SHA-1: 1a4db296d67eedd7696bfd41844ad57c78e30b3e SHA-256: 49b7a550ab4da33402abd2f17d5895efd81aebf061b1c997e4809f4eaeac6b9c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of links designed to appear as legitimate documents but likely lead to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://jumiwimov.ru/award?keyword=cdcr+title+15+pdf
    • http://xruhdfo.site/halloween_activity_worksheets0wedo.pdf
    • https://cdn.sqhk.co/xawefigi/egiXfo3/bowatubajixipemawukix.pdf
    • http://blablablacar.online/74987957440inel.pdf
    • http://hairsprof.ru/credit_suisse_wealth_report_2017_databookg5v3z.pdf
    • http://websporizle4.com/miseluvutap3oiz.pdf
    • https://cdn.sqhk.co/gixekoji/OihZohi/merge_magic_treasure_chests.pdf
    • http://bcpzonasegura10beta-viabcp.com/flower_brushes_for_photoshop_cs6_freehgxxg.pdf
    • https://cdn.sqhk.co/zovitamojim/fhidBQR/cable_size_calculator_uk_12v.pdf
    • https://cdn.sqhk.co/wuvitatutuv/bhbidb2/98271912825.pdf
    • https://cdn.sqhk.co/gederanew/kVhg9if/maronuxuvawagukikisusuni.pdf
    • https://cdn.sqhk.co/zijigemeworu/Ktjdmid/3d_death_race_car_stunt_racing_games.pdf
    • https://cdn.sqhk.co/marezotije/jTH06yF/red_heart_vector_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sazariwapa/zikunogagote.pdf
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_89648d20daa54a479707afcab194ae75.pdf?index=true
    • https://s3.amazonaws.com/fisulefajow/toxic_metabolic_encephalopathy.pdf
    • https://s3.amazonaws.com/fejakixoweka/tawazuwovexubup.pdf
    • https://s3.amazonaws.com/jeworurowam/latobo.pdf
    • https://s3.amazonaws.com/tixeligufokup/rafodu.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_9a465989f3534eddae99e0c5f4bf9354.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/maths_formulas_to_remember_gcse.pdf
    • https://s3.amazonaws.com/benubapopikaj/acestream_android_chromecast.pdf
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_0f6afb8e13e64536bd896d828ee466ef.pdf?index=true
    • https://s3.amazonaws.com/lomogas/bariyan_ashiq_mizaj_akhan_terian_mp4.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_off0000d9b2.bin
7f106aa4e88ec39ce03c0e89ee22d400f4d85ffc0d9d4aa486ad537bcde9bcd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 4840 bytes
font_01_sfnt_off0000ea3f.bin
bb87bacae7a753a7819c5d04d68157aee3dbf692c08b8f4c5846ff7a39f46ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10416 bytes

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