Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e3a13af6e67e9a…

MALICIOUS

PDF

85.3 KB Created: 2021-03-21 02:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7a569e69dac2cdea156dc065660835b4 SHA-1: 0c0763da0519f84e1b1b04015db9798813b2d9c6 SHA-256: 28e3a13af6e67e9ad8a65473753f5558d4b54169349eded717d53f865558fc8d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to a book title, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=blood+in+my+eye+book+george+jackson PDF link annotation
    • http://fisutef.iblogger.org/6_rights_of_medication_administration.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/general_annuities.pdfIn PDF document text
    • https://vurikiwuguwek.weebly.com/uploads/1/3/1/4/131408439/numemararegotow.pdfIn PDF document text
    • http://niwifara.22web.org/structure_in_writing.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/9859970.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/7213922.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/totetemalabibolu.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/072351.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/nuzakudelojofox.pdfIn PDF document text
    • http://zugezufamuluki.iblogger.org/fluke_dtx_1800_calibration_services.pdfIn PDF document text
    • https://xegavepixax.weebly.com/uploads/1/3/1/4/131452872/zuforaduvob-rokom.pdfIn PDF document text
    • http://betawajapasex.22web.org/togoxasapetazudefezukax.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/boarding_pass_template.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://xasagode.myartsonline.com/xulipufanojalavawibad.pdfIn PDF document text
    • http://gajutovowitexij.rf.gd/22586116753.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/85137671107.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/35116222592.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/quadratic_equation_word_problems_with_answers.pdfIn PDF document text
    • http://fepadegan.epizy.com/61095796133.pdfIn PDF document text
    • http://nigowona.rf.gd/bizukulizijixe.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/how_to_make_road_bike_a_gravel_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/basic_electronics_books_free.pdfIn PDF document text
    • http://kabexumowexugu.epizy.com/mice_and_men_summary.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_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 5396 bytes
SHA-256: 7a36c3a791689d9c671cf123356450ec40bdcfaf46602d048193597733dabaa2
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 11564 bytes
SHA-256: 45bc4ad02cdfa9b32a387922f111c3c94453ed9d3cbc437369db3d1e0cb06675
font_02_sfnt_off00013807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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