Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d3e35ab15a3a20…

MALICIOUS

PDF

86.7 KB Created: 2021-04-04 17:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8e4bb646438307e00f20445aa4e73cc9 SHA-1: 75b7b14e209119fb6c1c206e8bde875984406fc1 SHA-256: 85d3e35ab15a3a20e42ceeb6c83cdebbc17a2497053d4726970b264e158e0e6f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'mezovuduw.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to changing a battery, suggesting a social engineering tactic to drive users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/aws?utm_term=how+to+change+the+battery+in+a+first+alert+sa340 PDF link annotation
    • https://cdn.sqhk.co/vimewiki/h9f6Pug/pakistan_best_chat_app.pdfIn PDF document text
    • http://vienvozvrat.site/speer_reloading_manual_free_downloadlzpwx.pdfIn PDF document text
    • http://cetakchantek.com/98552026014sn9wf.pdfIn PDF document text
    • http://katalog-siberian-force.online/review_of_rob_bell_book_love_winsxzasa.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/ibjfIuO/bumble_bee_craft_template.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/34836397248iz3w4.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/Dgefiby/igo_navigation_app_store.pdfIn PDF document text
    • http://ashotik.space/apple_airport_express_download_speed9obkh.pdfIn PDF document text
    • http://mebelintera.ru/tascam_414_dimensionsdr1cl.pdfIn PDF document text
    • http://jakor.pro/xoxideluvsslf.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/mkZhgje/94919269889.pdfIn PDF document text
    • http://grantmedica.ru/16323878821rf9az.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/abpmc9Z/spaceflight_simulator_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/jiWrqtp/dopitepopomegefupuruk.pdfIn PDF document text
    • http://sun-italy.space/ponasz1bfi.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/w6jdTrS/paradise_island_sam_and_colby_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/43d795ae-5b8f-4507-9ca3-0d70b3004373/tevodirobinimutupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee15685-1caa-465b-9a63-df36231ddf0f/tcp_ip_model_5_layers_vs_4_layers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5b1ad1-465d-4b6b-9d67-5a91028b8df4/great_outdoors_smoky_mountain_series_electric_smoker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242d341f-4b7d-4b0d-b7fc-e1edbe02e03e/al_quran_al_kareem_maqdis_word-by-word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1150cd7-d6e5-4812-a7f7-355ae2f19e3a/what_causes_service_engine_light_to_come_on.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 5620 bytes
SHA-256: be41cc28c7ec6ca4d61c17c38204de5c595f87d38274c9e35fd4bf1fa29f1c24
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11396 bytes
SHA-256: ee52ac87753336dfb34395389b5c81cea7060d43c603ddb60159dba203430431
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00013ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333