Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f907bc00cbab34…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 21:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5615bf76d494d2734d03d25bf4a3cc77 SHA-1: 03412c7ce0705f95133860dc00814843e9d1da08 SHA-256: 92f907bc00cbab34c97f736df892d0c43b0c8bad55de5adc3a4efd531d6d9085
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, forming a link farm, with the primary URL being https://seumenha.ru/wix?keyword=complete+do-it-yourself+manual+newly+updated. The document body, though heavily obfuscated, suggests a lure related to a "do-it-yourself manual". No scripts were extracted, but the extensive use of external links points towards a redirection to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=complete+do-it-yourself+manual+newly+updated
    • https://maxolesaso.weebly.com/uploads/1/3/0/7/130776327/725970.pdf
    • http://digovin.getenjoyment.net/preterite_vs_imperfect_worksheet_free.pdf
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/266898a03c97a0.pdf
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/6731551.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://diwavubodinaroj.myartsonline.com/definition_of_validity_and_reliability_in_research.pdf
    • https://s3.amazonaws.com/makumapikeze/group_discussion_report_on_social_media.pdf
    • https://s3.amazonaws.com/feseni/31484074819.pdf
    • http://nexopuvesoreben.epizy.com/perform_starter_current_draw_test.pdf
    • https://uploads.strikinglycdn.com/files/dc785526-590a-4c2e-a232-3eef90d3b739/tercera_sesion_de_consejo_escolar_de_participacion_social_2019.pdf
    • https://uploads.strikinglycdn.com/files/fb601c52-c6ac-44fc-845a-fd35d3a605a2/15546688279.pdf
    • https://s3.amazonaws.com/gofilafixu/balupu_audio_songs_ing_come.pdf
    • https://s3.amazonaws.com/lorifumofelu/what_is_the_main_intention_or_purpose_of_the_author_in_writing_a_persuasive_text.pdf
    • https://s3.amazonaws.com/fizaxo/cloudformation_reference_s3_bucket_name.pdf
    • https://s3.amazonaws.com/pizivurapab/worelenagififunulesusenaw.pdf
    • https://uploads.strikinglycdn.com/files/53a185c0-3321-4c35-bbc3-d2846e014723/what_does_the_bible_say_about_paradise_earth.pdf
    • https://s3.amazonaws.com/wobuzisibal/14611187287.pdf
    • https://s3.amazonaws.com/zijivevip/total_gym_commercial_products.pdf
    • http://dolanuvusipegu.myartsonline.com/sociology_book_by_shankar_rao_free_download.pdf
    • http://razogop.epizy.com/bilinear_forms_linear_operators.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_off0000f0d0.bin
cbecfbf0868f98c4c366e183bdeddfa07ef26e25b9b9b0352738a207e2f9c44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5320 bytes
font_01_sfnt_off000102e9.bin
146ea75120b7b6037f058a31c09343b68a38cc54141099891daeae0156837e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 11380 bytes

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