Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da4f850c5ce2180…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 11:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 009f208d20a4c8a75883ec62186cd769 SHA-1: 6e675d8a5c3b683749494b2547950365a7297aa5 SHA-256: 7da4f850c5ce21800a08a8601b75b37612f137ea7d7255252c991d12a8475aa6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated SEO-style links, indicating a link farm or phishing attempt. One prominent URL, 'https://jacksth.ru/wix?keyword=daily+geography+grade+4+week+25+answer+key', is presented as a search result for educational content, likely a lure. ClamAV detection and ML classification confirm the malicious nature of the file, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wix?keyword=daily+geography+grade+4+week+25+answer+key PDF link annotation
    • https://cdn.sqhk.co/gitovera/aAlhejb/47787469176.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/59QKjfe/12525071020.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/sAhfdPM/gun_factory_shooting_range_near_me.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/amarilli_mia_bella.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/xonawomomajexubopudatuv.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/53332162438.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/ijeiiW1/mitururitofapijimejapavo.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/napejaxosinages/92789992499.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/caravaneer_2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/how_to_get_original_birth_certificate_after_adoption.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_d2a85875ec0f464e9128eae44b106ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/78136451541.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/88817900652.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_55faf69caf894c20bc96474edbd8a5fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/10364726744.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_e687d4ace4014dc8befacb43ac1be21e.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_37924d2c15db49a1a9cb6484a35648f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/ligirazezexu.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/mefixoserime.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_d3adc92aa6b24475beb90f3f2a924a4b.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_460d5b5e8dec4184afc2631fbe44ad54.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_dc8f913bc3a7446fa39e4ec6d9cf8be5.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_295678554970417193cb4cbcc487545b.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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 5824 bytes
SHA-256: fe94c55bd0c2e6b7c96f489c0fd5285ede670c2d75e9687096d4b47aef5382c4
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10884 bytes
SHA-256: 34ac2ac555417e4a258d933e4e01431d48a88916ff7ec39163747dd7516faa35

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