Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5903ebada549e5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-04 14:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3b81059b082f8aa99ec133c021831d80 SHA-1: 3e2ead42706d1127827dcd685f03e9b9025dce88 SHA-256: ba5903ebada549e59e228e5e988891b0e84f29ad2eada4c688445185fd2c85a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links, indicating a link farm or SEO poisoning attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=financial+peace+university+maryland PDF link annotation
    • https://cdn.sqhk.co/dikulodut/ohjgi9T/subegozenebikajunapidafe.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/As0hajh/4273850273.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/jhaR8gi/17190289377.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/eV7Eg7u/lunaw.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/hehaNge/crash_car_smashy_road_2.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/HFQvhg3/legend_of_empress_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/TphiP95/1063334374.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/jf3W4Ew/rutgers_child_care_network_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/alternity_warships.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/bandook_margi_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/jodo_gyan_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/bsnl_internet_complaint_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/is_tokyo_disneyland_open_now.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/more_accessible_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/best_organic_survival_food.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/kulogomo.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/cien_aos_de_soledad_analisis_literario.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/17483286429.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_2dc1132d1e15488a954a7a5d44032429.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_b177003c90c1488292760ee4b9720a5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/18517942484.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5336 bytes
SHA-256: a6229a610f87c1854f332740d86b5556b55f1e748c10fda2b8a57619b4b77fc4
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 11528 bytes
SHA-256: 538948a7b025a59287c061f1d6271ed14ff0d074dd614c6b0953ff99106e58e9

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