Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a52fe1b7836bab…

MALICIOUS

PDF

75.4 KB Created: 2021-03-13 20:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e656eca407dd45b961154b07560a09a SHA-1: a116df5ca52c37cc507e45c125d47da3b367d341 SHA-256: 48a52fe1b7836babf7bf8b591832465bc3522fd5fecfe9afb4e6a11dc29a7f42
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though partially obfuscated, contains references to 'wkhtmltopdf' and 'blogs de libros pdf para descargar', reinforcing the lure of downloadable content to mask malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://soxebez.ru/award?keyword=blogs+de+libros+pdf+para+descargar PDF link annotation
    • http://yourlivehelp.com/soxifq7lws.pdfIn PDF document text
    • http://1offpark.xyz/531306827803firo.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/does_kindle_paperwhite_have_a_dictionaryzkx1g.pdfIn PDF document text
    • http://ziwefewixus.iblogger.org/how_do_i_scan_multiple_pages_into_one_epson.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/1302049727794316.pdfIn PDF document text
    • http://fitokapss.xyz/12529898438ij58j.pdfIn PDF document text
    • http://pedrons.space/geometry_geometric_probability_worksheetxss88.pdfIn PDF document text
    • http://hopecommunitynaz.com/el_nombre_de_jesus_kenneth_hagino8dp6.pdfIn PDF document text
    • http://sellamorem.com/us_history_quiz_24w03l2.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/nefunupu/meruliwovov.pdfIn PDF document text
    • http://derutufur.rf.gd/how_much_does_a_commercial_drivers_license_cost_in_nc.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_cff70bab91f14bf8a3b65b75ceb45ce1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/59234852135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a84409-2456-41a6-bd9f-92b3c616bb8c/14494778961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d16172-f42b-4ce6-a1f1-17eb4117491a/42146714808.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_6d9340e142604f82bb29a1f3d55734d4.pdf?index=trueIn PDF document text
    • http://furivel.rf.gd/39567281654.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f725a8d0dfcb4f03a4ddb61432ddc7a1.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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5512 bytes
SHA-256: 9d622c4a93cfaffa7618bd78a568bba07652434bb090a2b70810f3796749a600
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 12404 bytes
SHA-256: 768cc8eff71809766d3505d3da75e554702d2579710fdeab01cae2234ff38dc0

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