Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb79f528428d54…

MALICIOUS

PDF

81.2 KB Created: 2021-03-14 16:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7d563f0ec0416ad83da4085a10a932 SHA-1: 13be09ccbe2aadc2e1ce72cd41d5b00a2fe48c91 SHA-256: 90bb79f528428d54ed3f54fba2baa90bee483cf1d617bce2aff631d97a7105b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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-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://soxebez.ru/award?keyword=coldplay+the+scientist+lyrics+pdf
    • https://cdn.sqhk.co/kiribikiv/ihMjaij/singing_in_the_rain_good_morning_clip.pdf
    • http://kumululurug.scienceontheweb.net/how_do_i_report_my_ebt_card_lost_in_nc.pdf
    • https://cdn.sqhk.co/pujapipiwat/jbhjjhe/love_birds_soundboard.pdf
    • http://mibilivo.scienceontheweb.net/1001_books_to_read_before_you_die_2020.pdf
    • http://rekijiwowak.scienceontheweb.net/56551883105.pdf
    • https://cdn.sqhk.co/suxavawudomo/bFjfifc/notepad_plugins_compare.pdf
    • http://jivavesomuviz.getenjoyment.net/vufopezaxibetajuga.pdf
    • https://cdn.sqhk.co/suxujaba/jNjeHV8/57180844562.pdf
    • https://cdn.sqhk.co/xurajalijok/hbifXgj/battleline_tactics_ios.pdf
    • http://maxobujixeweden.sportsontheweb.net/42971306236.pdf
    • https://cdn.sqhk.co/savimatuv/hhcTyvX/3d_brick_breaker_revolution_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d6fba8df493c47eaaf9a53ba6cda5010.pdf?index=true
    • http://bidilud.rf.gd/52232606006.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_bc078e9a1a7f4dcc93b22665ff83942d.pdf?index=true
    • http://tamakibegotilo.epizy.com/grobag_tog_guide.pdf
    • http://fufudaloxola.onlinewebshop.net/gelajil.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_ca650a8d82a449a6b46de13486ab5d4b.pdf?index=true
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_0cebd122c6a548b490268414a964d3fc.pdf?index=true
    • http://suvusere.epizy.com/laguna_madre_fishing_guides.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f3.bin
02ae784a1e5b1e217e12ccba17c32803102a491257e95d4f70df3bed7f8c2c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5248 bytes
font_01_sfnt_off0000f8c9.bin
50ad56acb43c809edec906cdea12196cea516e5943018bf76430d954ae876c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 12356 bytes
font_02_sfnt_off00011ff3.bin
0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16164 bytes

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