Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7290f993abb4d99…

MALICIOUS

PDF

83.1 KB Created: 2021-03-06 17:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d30be65a9cef010d7bebe297c75cb76c SHA-1: 52d4ffca1f5926549b97e8249b935d93468a16d4 SHA-256: d7290f993abb4d99f81578961a0b2beb8b6328c4c8e4dd9f248b6478b2ffa26e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=norton+shakespeare+essential+plays+table+of+contents PDF link annotation
    • http://demask.fun/kenmore_gas_range_oven_not_heatingx1nm8.pdfIn PDF document text
    • http://mazanatur.space/how_to_determine_the_number_of_atoms_in_an_element4xzo1.pdfIn PDF document text
    • http://upgrade4me.com/pilot_near_me_with_subway71iei.pdfIn PDF document text
    • http://frukt.fun/ragenajefq8ffe.pdfIn PDF document text
    • http://proba7.xyz/762095660283rbq6.pdfIn PDF document text
    • http://nutowokamo.iblogger.org/81166287671.pdfIn PDF document text
    • http://interplast.ru/gigugogukufupunueizlw.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/android_game_development_for_dummies.pdfIn PDF document text
    • http://nebo-baikala.ru/838786726970shtc.pdfIn PDF document text
    • http://topsale.pro/jorozin85hrg.pdfIn PDF document text
    • http://asta-stroy.ru/who_tb_infection_control_guidelines9dnvk.pdfIn PDF document text
    • http://a-trvl.ru/jewel_cichlid_care_sheetad2hv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piserujirabubam.epizy.com/vudosivukejutitojizumi.pdfIn PDF document text
    • https://99f07d18-f615-4afc-a518-2230828c2232.filesusr.com/ugd/4cd51e_f2840cafbefd4eafa44c11064d74cdca.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_1c8823a6a9ee414ebae17cb825df3959.pdf?index=trueIn PDF document text
    • http://nelevevupa.rf.gd/75776146668.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_e514036323ad424b9f647b09e01c377e.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_7130929731924cde985d14f254af4bdd.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c74af2502f854c8e87128301b7c8f7ab.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_0ed89445177d4f30847aeb20edeb03e2.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_1c20bb96e485491f88d4f04129ae8bd7.pdf?index=trueIn PDF document text
    • http://dikanozep.epizy.com/4775087101.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_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 5376 bytes
SHA-256: 575fdc483de165af9b6a13e062a47c1bc6e09007887fa2c3499316d64141f3bc
font_01_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10900 bytes
SHA-256: be0e2b596e0ce6dcfcd2bd1b532c3c5faefcd0d06c1c059dd8d6e9103159e3d8

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