Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dd18c05faffa00…

MALICIOUS

PDF

65.1 KB Created: 2021-01-03 07:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6539ba4f9a5323fb9fa45f38bfa76146 SHA-1: c121c5511b605e47e5a71b8f6754805832314a79 SHA-256: 24dd18c05faffa000be385313593ad1ff7f8d8dad7406dc7092f227e34d68a69
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=free%20survival%20fire%20battlegrounds%20apk In PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/a88451e1.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/34338c1b-165c-4816-bea1-e006b5dbfd31/online_homeschooling_programs_in_illinois.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/mahoning_county_auditor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef67361-9df3-4255-946e-f6c6630d44aa/34723820725.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/cincinnati_public_schools_administration_of_medication_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/ice_candy_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2832c724-7e83-4b8c-960c-ef17e60f826c/16072418014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8119281-2da6-4694-b77e-16bf6f4c651f/netmap_modl_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/govomiviworemudakob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b701b7ed-8c10-4c6c-b9f0-92852b15dd1c/wumutarivosanojurubez.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/niwesakefododiratovet.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/baxexufutinimajuwebi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB31 5428 bytes
SHA-256: c4d5121667e0afb148a02b06050e419f45e85f2ac36828783c8296a40269ea20
font_01_sfnt_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 1956 bytes
SHA-256: 12856e2a8419ee26cf17265701ada4e06c644cbb697466eb1b676e57e57d630a
font_02_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 9472 bytes
SHA-256: cabfe987d5adb94c438144ae511c7d4a51a1cb6468753adf3c05c39655d1ee04

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