Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce97fdc1b9b050cc…

MALICIOUS

PDF

72.6 KB Created: 2021-02-22 14:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8a750003026b7f680ec15992aa8ac17a SHA-1: 94170abeb39a9f58e4d61ee8c152b04c46af9b8a SHA-256: ce97fdc1b9b050cc2c2c75f9522f3ad2583bec9cf747e14b65d4f083a649700e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various PDF files hosted on disposable domains and subdomains. This behavior is characteristic of SEO spam or phishing campaigns designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • 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://bologen.ru/aws?utm_term=how+many+carbs+in+a+taco+bell+chicken+chalupa+supreme PDF link annotation
    • https://cdn.sqhk.co/zebimapajod/jgjh3ie/detodegejo.pdfIn PDF document text
    • http://bluetea.space/mimefoxolixexe5bh1k.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/89169682773.pdfIn PDF document text
    • http://roduvogixaxo.66ghz.com/wavukurupolujimu.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/ehbjg3z/adventure_landing_mini_golf_raleigh.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/gg9sHRF/knives_out_house_natick.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/icUyVc5/best_pc_racing_simulator_setup.pdfIn PDF document text
    • http://naturaleone.space/vukenaloxonr7m35.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/rijimire_suzisolasuju_kuranopa_poxova.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/4955997.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/tNhhjgu/40791203438.pdfIn PDF document text
    • https://kaseledewa.weebly.com/uploads/1/3/2/6/132682802/1315406.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/hbicicV/emoji_whatsapp_stickers_maker_apk_free_download_ios.pdfIn PDF document text
    • https://bipurubozebupal.weebly.com/uploads/1/3/6/0/136082727/8560628.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
    • 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_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 5412 bytes
SHA-256: 66cc2e5994c313929b102c22cc0547345e9bcba20771ba998de8f0f5ea8acc0c
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10744 bytes
SHA-256: bc7646ab5f7163c69c0559fdc3962925ba8c1d7ab1b8c8d9187beab53e10e393
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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