Malicious PDF — malware analysis report

Static analysis result for SHA-256 128462c7728091db…

MALICIOUS

PDF

74.5 KB Created: 2021-02-02 03:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d15b7402c58e5e743ebb59db84aee831 SHA-1: 10bc53a5df0fd89621460a63cdf5369ea9b6b7c6 SHA-256: 128462c7728091dbefba15dab5473a628ad820f421312de6547d1328c8296c30
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to potentially harmful sites.

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/aws?utm_term=internet+archive+wayback+machine PDF link annotation
    • https://cdn.sqhk.co/pegidago/tqyjbgF/1872122000.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/VgfIjeL/20574680131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_5fe773c326186.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/vaseke_razelibibaloniv_fifojajuselu.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/sukoti.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/noriwezap_berafexozazepo_numaxupuxu_gogufomafusudej.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/xigagosesopusem_mumafe_vamip.pdfIn PDF document text
    • http://fuvafutiku.22web.org/37981891417.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jahg1aP/86836185635.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/wixamupelinere/atoms_vs_ions_worksheet_answer_key.pdfIn PDF document text
    • http://renaxodemebi.rf.gd/89513464904.pdfIn PDF document text
    • http://zuwewabarabin.epizy.com/brief_information_about_madhya_pradesh.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/have_to_must_exercises_with_answers.pdfIn PDF document text
    • http://zalowakudedakov.rf.gd/latest_couple_wallpapers_free.pdfIn PDF document text
    • http://fusopub.rf.gd/ninexuvopolo.pdfIn PDF document text
    • https://webarchive.jira.com/wiki/display/HeritrixIn 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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 5224 bytes
SHA-256: 652fdc25765e7e77461d3abec4375af197bd336107ae9931cbed9fa4acc56674
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10696 bytes
SHA-256: 8d0db6b4c5c9cab84e7ee6cc481eee4daf136a72924686e02a798880f8c6da00

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