Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f80233c6a1983aa…

MALICIOUS

PDF

72.3 KB Created: 2021-02-27 21:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2a22a9a0f5905fce7b354c30c6055f9 SHA-1: d10b2927c7de35d7aebabe46dba811e385eb0be7 SHA-256: 7f80233c6a1983aa91fb3d4b33b7adb679a0b014bb20c215e1d6af3f9a4f60a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are commonly used to redirect users to malicious sites, often for credential harvesting or second-stage payload delivery.

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://kuzutuzo.ru/123?utm_term=power+cooker+recipes+rice PDF link annotation
    • http://qupieasy.online/jevamopusekukomix5s7xn.pdfIn PDF document text
    • http://justamorem.com/dojoxpu47c.pdfIn PDF document text
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/1953391.pdfIn PDF document text
    • http://unityfree.xyz/58460025996ptms5.pdfIn PDF document text
    • http://big-ita.space/modal_verbs_definition_in_urdur13w1.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/9704386.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/fsujgmO/zevukupako.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/doguxodanu.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/doOCxid/texiwixejomajop.pdfIn PDF document text
    • http://glav.info/engineering_lab_report_abstract_sample4mjew.pdfIn PDF document text
    • http://bewelaxoludiw.22web.org/arduino_tutorial_24.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/zopiretijet-jevovan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497071/normal_5fff7c0bb9cea.pdfIn PDF document text
    • https://cdn.sqhk.co/riluvexudeve/jfc7Phf/free_robux_promo_codes_october_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_601a9c1a5f079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kituvofaxur.epizy.com/ecommerce_template_html_bootstrap_free.pdfIn PDF document text
    • http://zotowivivakav.rf.gd/rupubez.pdfIn PDF document text
    • http://xomedejufe.rf.gd/zutajitaselupavefupi.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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 4844 bytes
SHA-256: 8d8624c8e7ab28a3d99b1a9a52a760087fd6efc74511c3a6e2c10a6936355ebf
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10376 bytes
SHA-256: 10d72133fb3d72709676d4a80a27b395030f24c010e9faa9cf9898afcafe5ee0

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