Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee57ca6ac4ffe767…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 15:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b6e65e8662f048a6cd2ea0401a45912e SHA-1: ed0b66d18bc1092aedb67cb25f343ad26fbc1c99 SHA-256: ee57ca6ac4ffe76767b7f7fc13a87f5f8fd55ceedc8612a6b907cbdc33e6778b
164 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 SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external links and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=books+on+essay+writing+free+download+pdf PDF link annotation
    • http://italywom.space/nightcrawler_fishing_wormstk4jq.pdfIn PDF document text
    • https://bebabigi.weebly.com/uploads/1/3/5/9/135977904/6364336.pdfIn PDF document text
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/7415376.pdfIn PDF document text
    • https://sezitolu.weebly.com/uploads/1/3/4/3/134367117/02e6cb454b1d233.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/jutiboj.pdfIn PDF document text
    • http://mixed-rootwork.com/best_editorial_calendar_templates9ddga.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/vuravu_konuniwobovaj.pdfIn PDF document text
    • http://netewe9.xyz/9th_class_biology_book_kpkm60yi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_edf42fddb85c4795a91cc0a87fd83716.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fibesezati/3236917432.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/20703745287.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/resoteribisavaz.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/guidelines_for_central_line_placement.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_c493a68782994fa0a0fb5f5dc6a69628.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/audiometric_test_booth_certification_form.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/lologusamejuf.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_b345f1b52eaf4ede86077e08d754b89c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/factory_reset_samsung_s7_android_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/loralososefaletedu.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_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 5516 bytes
SHA-256: 8ab9987b964f7f044f1ce0c060541259b47e6d502ea5b88c8787b3049c2c35da
font_01_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 11192 bytes
SHA-256: 695efd284161c0cfda618b06280fe0f8a98d6f6bdbe4e51c186ce47b0e8da475

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