Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcd780238f05b17…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 11:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5eec1d7d7d55bfc9bcd52df201d3c4f1 SHA-1: 70bc7b4e61d15a269a18e65c7e887965a84e6676 SHA-256: efcd780238f05b1766e4ef84f1ed3c201d50e1de5d37e1afc73c7bbcdb4561c8
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit user interaction for malicious purposes.

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://zajinet.ru/award?keyword=language+barriers+to+communication+pdf PDF link annotation
    • http://kigalasabipigo.medianewsonline.com/january_2020_calendar_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/7LoV07Y/4321360422.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/hjhiYuv/91321920620.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/todaxe.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/xajowu/foper.pdfIn PDF document text
    • http://misosemarimo.rf.gd/disputing_bad_debt_on_credit_report.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_e94978d46eb5407f9ea12af1b8d7cf37.pdf?index=trueIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/suratalimosodafa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/61842823167.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/lab_report_4_chemical_aspects_answers.pdfIn PDF document text
    • http://xarenijarowu.rf.gd/what_kind_of_oil_for_a_chevy_equinox.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/29176196594.pdfIn PDF document text
    • http://sinalowus.epizy.com/tan_application_form_49b.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/ohio_bobcats_logo.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_aeeebdeb3e0b42559414e30105a4bde7.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_54784971c4304810aea0ba2c0154f526.pdf?index=trueIn PDF document text
    • http://wejixotadubu.epizy.com/what_are_newtons_laws_of_motion_and_gravity.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_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 5524 bytes
SHA-256: 119cb1e01a8255246fdfbd0119ee004d5b2d8bdc0d831f1510d9eae59fb52245
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 11040 bytes
SHA-256: 7b00873a12ab54d05bcb54bbee70d69f7a3dec700628060b5a55e2ab277667d7

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