Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f7fa6a54df4dd6…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 00:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 94b320086440fa982fae37fbc5bfa633 SHA-1: 95e7ddb8816411901fef6bfc851961b3a773e81c SHA-256: 50f7fa6a54df4dd6db484a4187bcf5ca9fda610eb93f1f5d3801c68558e31095
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 numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains text related to graphing worksheets, which is likely a pretext to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=graphing+systems+of+equations+worksheet+algebra+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5feb00188f2a0.pdfIn PDF document text
    • http://online-bestshop.xyz/cuisinart_on_demand_coffee_maker_manualbay86.pdfIn PDF document text
    • http://front-glass.space/finerapadupilogebususiwagtsab.pdfIn PDF document text
    • http://tcerkovniekupola.space/wegaxexigulikh4ym.pdfIn PDF document text
    • http://shop-you.xyz/pinazowavutosududikakagbmt63.pdfIn PDF document text
    • http://cetop.xyz/how_to_use_ac_remote_control_sansuig3b58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5ff756819ea54.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/giehgjP/20630281399.pdfIn PDF document text
    • https://cdn.sqhk.co/lunajevon/Qhaignf/cosy_home_bed_sheets.pdfIn PDF document text
    • http://moitender.org/vermont_castings_defiant_encore_2190_review6igst.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_601703c5224d7.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/kjfjeSY/72672948021.pdfIn PDF document text
    • http://kellys.space/xivekefukx19jf.pdfIn PDF document text
    • http://wide-mean.top/22177125107fywzt.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/muvevanepen/ct_guided_pubic_symphysis_injection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba9ddc1-b457-4aa8-a94d-4c658f185918/wd_tv_live_streaming_media_player_firmware_2.02.32.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/rogers_tv_channel_guide_brampton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba63305-2327-4e8a-8150-b4bc37b39d45/pisujinusemufele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea17a65f-8ec7-4dc2-b80a-1ac6c35687da/ipod_nano_4gb_3rd_generation_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/roweguxovo.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/videoder_hd_video_er_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9998fda5-26a2-499c-826a-c692b525d39a/52158006860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df98759c-f130-42b6-891d-d2c205699a00/zoxiwikikojelofudi.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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 5920 bytes
SHA-256: 7e1b127251d195773566913e85d427455a7bf0bd699fb38cd5caf0fb2a690e2a
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10384 bytes
SHA-256: 6f4184848c71a0d4acb3c9f445e1a44d47f89f7c083c59898bab19a18c14fbed

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