Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b44a453e48d22bf…

MALICIOUS

PDF

69.0 KB Created: 2021-04-22 00:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d50ea4f17317179678bbff349ccfb2c5 SHA-1: ba4a760b49ceb394e886961b07b961bb66c84066 SHA-256: 1b44a453e48d22bf69762354e86af9c6246a8c3c7832f90f03b1a09e9a2df348
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, designed to lure users to malicious sites. The heuristic firings indicate the PDF is a link farm and redirects to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=junie+b+jones+books+online+for+free In PDF document text
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/nuwapofokuxir.pdfIn PDF document text
    • http://gijejidil.22web.org/53531150145.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/fokus-wipugig.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/kapik.pdfIn PDF document text
    • http://copyrighthelpptteam.com/numerical_recipes_in_pythonrl1dw.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/3529696.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/47371939556.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/27618789440.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/black_and_decker_18v_cordless_drill_battery_charger.pdfIn PDF document text
    • http://prostosite.site/let_me_explain_studios_pornunvlc.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/visefibisimeruluzitoveba.pdfIn PDF document text
    • http://euroshopmn.space/anatomy_of_a_scandal_book_reviewk1g8e.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/12975898380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivikonalijuto.myartsonline.com/annie_full_play_script.pdfIn PDF document text
    • http://bibesatu.epizy.com/pensamiento_cartesiano.pdfIn PDF document text
    • http://pekinomigaw.epizy.com/waduk_jatigede.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/77092644392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a695f9c6-ab66-4e29-a147-d20afa409ce6/leave_slang_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8ad50e-1df4-47ff-8287-652f9289fd33/bose_sounddock_series_2_not_charging.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_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 4820 bytes
SHA-256: f25c3473b4a6e1a3f4dda3fad58a4651e5000a0f94e9e4355576727ebada741e
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 11224 bytes
SHA-256: 05690e0e763ac71003711726eeea072e4aa03536c94df22193462770345d8e97

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