Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ec46bc45e23ca6…

MALICIOUS

PDF

91.2 KB Created: 2021-03-01 08:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a642083e31f5ce94b88e657246cb59e SHA-1: 327afb2e5301043b19dce70f6296cdcf62ac918a SHA-256: 27ec46bc45e23ca64032a11355d22dbce828630b5e3e35a833e08f95fa73f968
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. The document body is heavily obfuscated and contains metadata that does not align with typical document content, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/award?keyword=sunbeam+electric+blanket+flashing+f1 PDF link annotation
    • https://cdn.sqhk.co/fopujetoros/gcvjaie/xopogib.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/najakodito.pdfIn PDF document text
    • https://cdn.sqhk.co/fomanazoravu/jWF0TvY/farming_usa_3_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/jwcSg4n/nusakalojilopegijemix.pdfIn PDF document text
    • https://cdn.sqhk.co/balijanawi/jgjdgji/tiles_hop_edm_rush_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fd7b851d11e8.pdfIn PDF document text
    • https://webemibas.weebly.com/uploads/1/3/5/2/135298215/visotibuselavejodupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5ff63522204ab.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/ttPihjh/43745223160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisekajoreva.epizy.com/wallpaper_hd_4k_background_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/mississippi_aphasia_test.pdfIn PDF document text
    • http://dimesagir.epizy.com/iteration_gcse_maths_worksheets.pdfIn PDF document text
    • http://kenukune.rf.gd/experiment_23_chemical_kinetics_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/mortal_kombat_11_fatalities_ps4_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/vetamibopesagukekifakamo.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/asphalt_6_adrenaline_java_game.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/36630121993.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_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 5656 bytes
SHA-256: 178ad7d0dbc2139ca3cb266fe5890b793892a3f530328467d11980fcd0a0498b
font_01_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 11836 bytes
SHA-256: d91269e6ec37097c1115dd11495ebfda5105cf704d010bd32b3fff214df5bfd5

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