Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fbf8b55bdca3a8…

MALICIOUS

PDF

79.6 KB Created: 2021-04-21 03:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fa30d3799de0450691b95274fead6601 SHA-1: 5f21c7278de739cb4f5082627ab076b111fb37ae SHA-256: f1fbf8b55bdca3a855df4c8e66772bb481d7ac59e2d6bab085c4302b49cb96b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to unknown domains, suggesting a link farm or phishing lure. The embedded URLs and the heuristic PDF_SEO_LINK_FARM indicate the primary goal is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=keurig+k+elite+c+iced+coffee PDF link annotation
    • http://ritixibetono.mygamesonline.org/how_to_use_armitage_in_kali_linux.pdfIn PDF document text
    • http://fb-ig-copyright.com/574307983099ohk4.pdfIn PDF document text
    • http://zahlungsservice-ch.site/560196882433pvft.pdfIn PDF document text
    • http://creditscorehelp.info/jiziladofo0p62j.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/totowek.pdfIn PDF document text
    • http://vnatural.space/42776741929ua2sq.pdfIn PDF document text
    • http://studyweb.site/82463926799znrqn.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/fufiwiwotogitebevugow.pdfIn PDF document text
    • http://khareedforosh.com/android_programming_the_big_nerd_ranch_guide_3rd_edition_epubdcs7w.pdfIn PDF document text
    • http://reabook.online/pupagu7fikg.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/79430138394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_933acc152bca4edd891982c8b4ad90e5.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_c5a1918f18d44014a48bd07c372e5df4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/53081439069.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/john_deere_310e_backhoe_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/truck_waybill_form.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/gumuvafomejeboxepunamen.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/coryphantha_pycnacantha_cacti_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/how_to_replace_insinkerator_garbage_disposal.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/98575253038.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_1ca4bd7c14c14dd983677bf3e87f765f.pdf?index=trueIn 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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 4832 bytes
SHA-256: b55bcddd165a09d152435144c701b7abc4327f1f367621a4990729d5e662e7e9
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 11272 bytes
SHA-256: 6591482e4029de31b68f24b5515bb5e0e340a3d586734f9ced60099a0328adc2

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