Malicious PDF — malware analysis report

Static analysis result for SHA-256 317f03f6113aa5b0…

MALICIOUS

PDF

71.1 KB Created: 2021-03-02 18:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3715a17ccb71d7a692ea35b0b76b163f SHA-1: d34ca7eb3803c19c71e274009928cf475affcf57 SHA-256: 317f03f6113aa5b09ccb633d64baecf48b8c80774caababe5f25cb686a9c8c62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, with one specifically identified as a lure related to 'animal crossing'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the heuristic flagging it as a link farm on disposable hosting further support this conclusion.

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://baarspo.ru/123?utm_term=how+to+get+a+diving+suit+in+animal+crossing PDF link annotation
    • http://gikiwasixe.66ghz.com/22087471499.pdfIn PDF document text
    • http://fusobilel.iblogger.org/wemataxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_600da2c33e2dd.pdfIn PDF document text
    • http://xesabuzusoneb.66ghz.com/mezefororojatubolawewutul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_6024f82572bb2.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/d33086f9.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/lhbhbii/school_driving_3d_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5ff68e837b186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fd702fed2702.pdfIn PDF document text
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/b40d45b10cf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuniguvip.epizy.com/acg_clinical_guideline_alcoholic_liver_disease.pdfIn PDF document text
    • http://felawikemuda.epizy.com/durable_power_of_attorney_template_washington_state.pdfIn PDF document text
    • http://jimulopipuxofom.rf.gd/rorajaxepuxetikajerif.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/2550118396.pdfIn PDF document text
    • http://zibozepor.rf.gd/wedokoremimorede.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/6358862593.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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 5372 bytes
SHA-256: 1aabe1ec789b58aa12bc21d89be73f561104aa2a763e28488c816f974597a1f9
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 9988 bytes
SHA-256: f79df626f127e0c0484ddb90ee6f4fd7f6851e4ff81ddfb097d6e7b62f83d002

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