Malicious PDF — malware analysis report

Static analysis result for SHA-256 590d82bff882bb7d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-11 05:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1b17a6c82b624d6bfbf3b5badbd2e011 SHA-1: 4df824aa14e4d1e677ed982085b2b8afd5dd7d4a SHA-256: 590d82bff882bb7d2f5b62cc4cbe477cec004fb752e5eb406920abea2809956a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/123?utm_term=writing+on+the+wall+piano+sheet+music PDF link annotation
    • https://cdn.sqhk.co/pirasemofoge/gj3ghij/minecraft_education_edition_experimental_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fe72edfa1f94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5ff933eec725f.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/fufobogurotol.pdfIn PDF document text
    • https://cdn.sqhk.co/votexeruwiti/dhcrRhh/wamopuwanofolurape.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/r5hghaT/69665623554.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/efhcCjd/tagex.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/PiirhgY/15113781866.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/jfV85fA/uniware_heavy_duty_aluminum_calderon.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/riwokusajitotuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_600b009fd9849.pdfIn PDF document text
    • http://dijobojanojo.22web.org/badig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5ff362473e7b6.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/aab04eae.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/9melUNG/39223407491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vugapadilubokis.epizy.com/badminton_court_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/jozevofom.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/5140594822.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/43734812593.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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 5332 bytes
SHA-256: 9dab53ea3ff5b0542625f4e39c0dea0957ebceec4b9af1b2aacd855dcc832e65
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10156 bytes
SHA-256: 3cd0313f6009390cd70805f3841b17f4ea72f1efdec9557d737b28167bfcf2f9
font_02_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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