Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3fed16c6a2f1b5…

MALICIOUS

PDF

74.9 KB Created: 2021-01-22 05:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a9bb8dc355eeb2d1eba13c47e6f45057 SHA-1: b9d2efa92ee2e4f556150fc40882e99e5d0720e1 SHA-256: 4c3fed16c6a2f1b532c1d9283b16ff1e96d5fe646dae2eb82b5bcf3c8ee04e7c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple embedded URLs, two of which are particularly suspicious: 'https://jacksth.ru/123?utm_term=dr+fuhrman+eat+for+health+pdf' and 'http://lajulufubugo.22web.org/12781700209.pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily corrupted, contains fragments related to 'Dr fuhrman eat for health pdf' and 'wkhtmltopdf', hinting at a lure to disguise the malicious intent.

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 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://jacksth.ru/123?utm_term=dr+fuhrman+eat+for+health+pdf PDF link annotation
    • http://lajulufubugo.22web.org/12781700209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5fe66efd6ad31.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/BZYgfhd/my_server_name_or_address.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jagetYW/tepiluzemenifusasom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd6527d634c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5feed325ba468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5fd7a758a7fbe.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/hd79hgZ/64621971544.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/cXiewgf/40835433858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fe9cbae2b0f9.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/pokorevalaxex/edelweiss_financial_services_annual_report_2017-_18.pdfIn PDF document text
    • http://tituroxir.rf.gd/59711026051.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/41498551610.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/polycom_hdx_4500_datasheet.pdfIn PDF document text
    • http://zatunikepozis.epizy.com/page_borders_templates_for_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/duxelekoseda.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/bavurulatev.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/video_collage_maker_apk_free.pdfIn PDF document text
    • http://parimafilifupev.rf.gd/6017653431.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 5104 bytes
SHA-256: c12d7b67f89ba0b94c27ac8c711a547281a88979a26d63ef6f63cf5140d5d2bb
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 10776 bytes
SHA-256: 932b522089db79c38ac6f99891683550f8d155913ffa7a3414a3dc7eca74863f

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