Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fb7f093b5c41da…

MALICIOUS

PDF

71.9 KB Created: 2021-04-04 10:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8588eed043d63ebc602e7f20c31bde18 SHA-1: d5e75e20831c957863ccf58faa403e88dff8721a SHA-256: c7fb7f093b5c41daf1de787669f396af13debe5278b6e751d54b091f8ce2ac05
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=el+camioncito+azul+pdf
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/fizamugek.pdf
    • https://peposinosodidel.weebly.com/uploads/1/3/4/3/134317522/c8c1bd4b0710.pdf
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/9d1269fd442.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/muvosari_zutinagekamov.pdf
    • http://zitirisiz.mywebcommunity.org/rufowifiwugewipiwoxevi.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/rolalene-kixuvusobak-biguvalutinetox-buredud.pdf
    • http://woxuruko.medianewsonline.com/psion_handbook_3.5.pdf
    • http://govuled.mywebcommunity.org/best_reader_for_books_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_d67260871d6444a9b0c651c9c47ec01b.pdf?index=true
    • https://s3.amazonaws.com/gavobawum/canada_post_change_of_address_notification_forms.pdf
    • https://uploads.strikinglycdn.com/files/d1bfe735-0b56-4d4f-bbdb-dd191e386110/music_theory_for_guitarists_hal_leonard.pdf
    • https://uploads.strikinglycdn.com/files/4c0cc19e-b5ba-4002-b486-6d6c17b7894d/which_dyson_cordless_vacuum_cleaner_is_the_best.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_0aac7414039946738c29daa850b637d9.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/juzinotoji.pdf
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_b9ad5289e71c472e98b63b76580108e2.pdf?index=true
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_760a8796e5f5462eb4f2bab61f6c128f.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_f0336c20a1724d53be976bd60592c22f.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_c0c30d4f40af4bc6b80cb126e2ffba20.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_f90522216a6e41f8b444eb77cb060808.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0608faed-d03a-4958-8e55-98811447db62/fofoxizaz.pdf
    • https://s3.amazonaws.com/lanubili/alphabetizing_words_worksheets_for_grade_3.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_d1bb195fb57c4adfa4ef5c39db01c730.pdf?index=true
    • https://s3.amazonaws.com/fovezewi/favazusowivomurufev.pdf
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_07c0a216e92b46fca93f823e0666bfe9.pdf?index=true
    • http://pudolajuji.atwebpages.com/pdf_converter_into_word_format.pdf
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_e7f378d1368e43628797ec526d6fa78c.pdf?index=true
    • https://s3.amazonaws.com/popisiburewixuj/autoformation_windev_14.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da21.bin
fca03352dd290618a256a26880a5221e681c571cea2eb31459c0a7938ade9e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 5036 bytes
font_01_sfnt_off0000eb43.bin
8e6f4d4a44ad813020f658c0315faf650a06bb19620f19d465cfdbe108c8141c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 11192 bytes

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