Malicious PDF — malware analysis report

Static analysis result for SHA-256 2380706e571b5c44…

MALICIOUS

PDF

65.2 KB Created: 2021-03-18 21:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0dd4e7eecd5431767b47c93309edd52 SHA-1: b70a5b55526c4bd98f5c7647740c2dd1bda00e1a SHA-256: 2380706e571b5c44a99f3568d2baddce4a8a533a6c0929a8982f20ffd65497f3
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=oscar+schmidt+les+paul+gold+top
    • http://domainlimax.xyz/variety_of_living_things_in_an_ecosystem_calledo5wjg.pdf
    • http://womenita.fun/the_bluest_eye_summary_chapter_5kbyrr.pdf
    • http://xenifizonuk.22web.org/arun_sharma_data_interpretation_6th_edition.pdf
    • http://getplafond.xyz/what_does_the_word_night_mean_in_the_book_nighta574q.pdf
    • http://kugamuwefula.iblogger.org/inspector_general_report_2016_election.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dukexajuj/ccleaner_apk_full.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_574a934faa384c74823e26b9fda1e582.pdf?index=true
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_d163b5f3b65f463ea485c7e0dd31b22c.pdf?index=true
    • http://natadomemorad.epizy.com/backflip_madness_android_game_free.pdf
    • https://s3.amazonaws.com/wusone/arya_dj_mix_songs.pdf
    • http://ganusigesu.rf.gd/monster_in_law_full_movie_free_123movies.pdf
    • https://s3.amazonaws.com/pujinit/vikow.pdf
    • https://s3.amazonaws.com/wofaxil/list_of_all_command_prompt_commands_for_windows_10.pdf
    • https://s3.amazonaws.com/tazopaju/grams_to_kilograms_worksheet.pdf
    • https://s3.amazonaws.com/pexodugosa/jesakofuguj.pdf
    • https://s3.amazonaws.com/vidadaviwal/html_to_c_mvc.pdf
    • https://s3.amazonaws.com/fowikorejodi/face_sheets_for_sensitive_skin.pdf
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_76ee2f030bd24b9894f3f7785ca7d16e.pdf?index=true
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_0801b30faf0841fe96bed2656f3d0e4c.pdf?index=true
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_6e5cd9845d4e4d4b90a3b543f09b45d3.pdf?index=true
    • http://felepukagerek.epizy.com/online_spanish_classes_for_nurses.pdf
    • https://s3.amazonaws.com/zafaronivaj/kotumogadefowiterefosox.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_off0000c5c4.bin
0377b7b3f6df5e05d14674b7a1fe0fb2885b63073dec7976750939ededa763ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 5516 bytes
font_01_sfnt_off0000d855.bin
c101068d53f88aa7a8b263d1aad843f8e2c881aab460f1455a554b0896192afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 9144 bytes

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