Malicious PDF — malware analysis report

Static analysis result for SHA-256 405845c8f8939f1f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 00:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bdcbfaac974b2bb35cef2772d046a645 SHA-1: d6a8a79c9b8fdc8974f19cc741960838e4a9f1db SHA-256: 405845c8f8939f1f80ef3666becab5a2357a90abd2840e0c2a5128419c5cd7be
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'Huck Finn' worksheets, indicating a social engineering attempt. The presence of external URIs and link farm behavior points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=huck+finn+from+the+adventures+of+tom+sawyer+worksheet+answers PDF link annotation
    • http://krokoboko6.xyz/beagle_breeders_in_ohionx7k8.pdfIn PDF document text
    • http://madusotiju.22web.org/ronide.pdfIn PDF document text
    • http://luxshop21.site/72556243285vlxh6.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/2776508623.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/fotosizutafitamudofipoka.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/jesus_today_albert_nolan.pdfIn PDF document text
    • http://yewes.fun/470976368870v4s2.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/28939443903.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/m4QfCpu/8984299793.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/FFjdJwl/78841879740.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/disneyland_map_2020_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • http://kzrovk.xyz/how_to_calculate_weight_of_fuel_oilr4mw9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_d9d53f0890a04d9a9e26c4b84a947772.pdf?index=trueIn PDF document text
    • http://sokipev.epizy.com/horizontal_box_and_whisker_plot_excel_template.pdfIn PDF document text
    • http://gejaran.epizy.com/how_to_use_ergo_360_omni.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/angle_relationships_review_worksheet_answer_key.pdfIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_a160e0d0a9cd44ec83af20adc122fca5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorulusof/vijeserizilusitikix.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/what_is_the_monthly_fee_for_planet_fitness.pdfIn PDF document text
    • http://jevusavisa.epizy.com/59592949951.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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 5508 bytes
SHA-256: a16f7ba1e0b52ec8581e8bb2f6335b8d76afd80afa3cbfca84b3bb005909fe1d
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10332 bytes
SHA-256: 59eef8eff24a21cda527f777074225c60f2d3be4c726c3a180e0155554eb1f3c

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