Malicious PDF — malware analysis report

Static analysis result for SHA-256 a759c604c3f6b3c6…

MALICIOUS

PDF

75.2 KB Created: 2021-04-24 16:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aa5e3a874d567aa6b4be144a8c99ade6 SHA-1: 2b91fa04bdaca4da8f609cac4bb76006c51af3ac SHA-256: a759c604c3f6b3c6e361b0845d55447977ca3af71efb2f9b57d859c2f3e06c36
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL, https://midufefew.ru/strik?utm_term=the+lord+of+the+rings+book+editions, is the primary indicator of compromise, likely leading to a phishing or malware download page.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/strik?utm_term=the+lord+of+the+rings+book+editions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4527237/normal_60031eb3a257a.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/dolagukimidujevoga.pdfIn PDF document text
    • https://cdn.sqhk.co/gizetinediz/ZgjUpji/ecology_vocabulary_crossword_answers.pdfIn PDF document text
    • http://kivafijap.mywebcommunity.org/33200876434.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/q5gcghl/ark_survival_evolved_crossplay_epic_games_and_xbox.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/E0gfhgE/cloning_vector_definition_biology.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/defectos_del_tubo_neural_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/Cuniege/tesegafasarevaxerepupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_6002c6523903e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/2017_ford_f250_service_advancetrac.pdfIn PDF document text
    • http://pekoguwomigurup.epizy.com/19328628600.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/gartner_studios_template_number_83004.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/36662929859.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/garmin_forerunner_405_gps-enabled_sports_watch.pdfIn PDF document text
    • http://tovegebipodu.rf.gd/vanusorazirefekogovuzuvot.pdfIn PDF document text
    • http://kusuganuxe.epizy.com/the_way_of_mental_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/rocket_science_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/57580054946.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/how_many_surahs_are_in_juz_30.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/90587133146.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 5112 bytes
SHA-256: 71048051ad6b3990a29d940db836f6ca01fdbb0d1fe04a309c008acb72dbfeb9
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11748 bytes
SHA-256: b4276339e264ce09f84267ced02265a0b0f910889215ec1124f877f8147bd3b6

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