Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b9f66d085027d5…

MALICIOUS

PDF

77.1 KB Created: 2021-04-05 17:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f8672a0f442caf6069315e67057155f SHA-1: 507a5243bf576411af9296e194c7e5a04a2fd3b0 SHA-256: 35b9f66d085027d59813f4a269055350b1928cba018c7746d1c41182589532d1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'checklist template for microsoft word' and 'wkhtmltopdf', which is likely a pretext to direct users to malicious URLs.

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
  • 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://crophysi.ru/123?utm_term=checklist+template+for+microsoft+word PDF link annotation
    • http://tolunisusij.22web.org/adobe_sign_document.pdfIn PDF document text
    • http://subbellassecret.com/680411179091s5a8.pdfIn PDF document text
    • http://lifeeuro.info/nebebipozaxubao6b.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/39270881461.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/78174127155.pdfIn PDF document text
    • http://gratoramaa.space/notagalanadajodijopumus6gok6.pdfIn PDF document text
    • https://mavuzoxawajike.weebly.com/uploads/1/3/0/9/130969593/56d52ea.pdfIn PDF document text
    • http://shoppingyxplus.xyz/ge_manufacture_dateipixh.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/on_writing_well_chapter_8_summary.pdfIn PDF document text
    • http://bobatorosas.mypressonline.com/77441829395.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/2cd56c42b0a15.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/5456561845796864.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/aviation_security_manual_doc_8973_restricted.pdfIn PDF document text
    • http://pochta-24.cc/xesopezuzeziziv6fm5m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebimomedunuzux.epizy.com/student_attendance_system_by_barcode_scan.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/benoit_mandelbrot_books.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5456 bytes
SHA-256: 91f94e93e33fea5cddcab888e21a3343c1d6ee00bf34242a1578d564c5552a83
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 10308 bytes
SHA-256: 9bd20ea39ff87d376e15410a97de3ca33ef48704c01f971977b0631dee87b3c8

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