Malicious PDF — malware analysis report

Static analysis result for SHA-256 3953f3bcb5ff899d…

MALICIOUS

PDF

84.8 KB Created: 2021-03-18 02:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f361e54457fd24e1203c55ac7cd75c4d SHA-1: 8dd99cec1968f48c32b070bb5b52aa242a0b6d5b SHA-256: 3953f3bcb5ff899d761652ea251ebd266bda59dcee1d59c2397d47c9c574e48e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to numerous external URLs, one of which is `https://jacksth.ru/wix?keyword=power+worksheet+physics+answers`. This pattern is often used for SEO manipulation or to distribute further malicious content, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=power+worksheet+physics+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416791/normal_60476a44566ad.pdfIn PDF document text
    • http://onsideball.info/pozumezemofufokagu9jb9.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/Aidjjhh/51581496625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fd2514627fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_6037455ee1f6c.pdfIn PDF document text
    • http://dietnatur.fun/26091652479pe5a4.pdfIn PDF document text
    • http://3bki.ru/66263366431069ws.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/iBsxP13/xavazazugutupedukubedot.pdfIn PDF document text
    • http://hisgohar.site/429651709537qzpa.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/eihqgfE/turejexumirefisije.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/12th_marksheet_online_2019_cbsewj6wn.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/gcihCpw/space_runaway_ideon.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/dWNgije/31351412835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_603149ddb8c65.pdfIn PDF document text
    • http://ompala.store/behringer_umc22_driver_windows_7ie02g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_1dd9904ca0264429b95ccda44398b6d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/97447037533.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/twitter_pictures_online.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_fcb367f2036f450ba85f8c7477a459f3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 5036 bytes
SHA-256: 40faf553548c49cc6d9b54a24c9e2077050e133999b27a795ee2094fa96924dd
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10924 bytes
SHA-256: d465ef05a0ba08b908bc758d667a4aa577efdffed7a1b49d483a682b4b0d4ec9
font_02_sfnt_off0001364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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