Malicious PDF — malware analysis report

Static analysis result for SHA-256 6250dfca7f0865a7…

MALICIOUS

PDF

79.5 KB Created: 2021-05-19 18:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eec9f95d01c74210d5e150ee01ba9690 SHA-1: e8e11c864c034698f06e8427c9d00bd3afd16651 SHA-256: 6250dfca7f0865a7a5cec964094678370acf3a8c927c1b9b43596d5a4ddf2e18
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a technique often used for SEO poisoning or phishing. The primary external URI points to 'https://kuzutuzo.ru/strik', which is likely a malicious landing page. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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 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://kuzutuzo.ru/strik?utm_term=used+auto+parts+in+montgomery+al PDF link annotation
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/lajenata-sujokuju.pdfIn PDF document text
    • https://bojumojomugo.weebly.com/uploads/1/3/4/8/134850871/4082914.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/4e740b5e5323da1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/943f6c53-fda1-4d68-918f-edc4ad6372c8/zulajofaretubevepiv.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/what_is_sociology_meaning_and_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/58162271100.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/bobibutud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b447fbc8-cafc-48a4-a236-7306b635f959/67520465045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c80b99-e6ed-4b2c-bc3d-bed68f6d7141/mepivezil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f20417-e223-429f-bcbd-ff83cc05d398/what_order_should_i_read_star_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a794860-79af-46c2-b50b-49954d6173d7/gajabenuxumifukivajira.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/format_usb_drive_to_boot_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f42d40-bea9-457e-8aca-0b7b35b2239b/32746370227.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/gukulowasajafij.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/tangled_before_ever_after_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d24b81-cc90-40ff-9d62-851d9287f4f1/dawijoxoxowamap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a752dad-eeb9-43a2-b68a-5050c2d97948/pevuzalaju.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_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 5372 bytes
SHA-256: c264c77aa9cccf7c4d7c150fc5c7c66f1eb34729df68031293cb21238591949d
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10336 bytes
SHA-256: 40ea78a50630a651fe844744203d7bd5aee62d9a7634842b86583e39f9232e10

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