Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b07bb2121357168…

MALICIOUS

PDF

74.8 KB Created: 2021-05-12 12:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e429695923beb032e411afa8e4ad4f27 SHA-1: e8d3d4a98b91630d619be013e5137f0db3cf5e02 SHA-256: 5b07bb2121357168e1ead422b70fb74c9bfc23b6cd9733c68fd875cb0bdb88a7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('druttle.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+to+practice+cultural+safety PDF link annotation
    • https://cdn.sqhk.co/pimidima/heheY6m/castle_story_inventory_guide.pdfIn PDF document text
    • http://sijowusim.22web.org/38847843084.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jggevjb/wudisaraloso.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/qjcfdTs/41041320651.pdfIn PDF document text
    • http://duxojiz.iblogger.org/pikudaborinawufuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaviweposaroku.rf.gd/lurasabaxorasadalazega.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/zojusuxozemadamofeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5488bcc-9792-4274-942f-bb0d8a82f32a/what_is_the_best_free_movie_maker_app_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7f00ba-ce17-43ce-bb5a-a342e197807c/sorudazudaxetadosufatel.pdfIn PDF document text
    • http://jizofaludem.epizy.com/ambitious_words_to_describe_a_forest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5823ed43-1080-4a47-b864-9a5fd92d08b4/how_to_plot_a_run_on_map_my_run.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/kegavarokazoxawumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f808f95-dd75-491c-9e65-ed49c28014ca/samsung_bd-p1590_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d76dc68-8db5-490b-b88f-e4d50d6af42e/50706215732.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/73723070073.pdfIn PDF document text
    • http://tetexamafikej.epizy.com/white_chunky_block_platform_heels.pdfIn PDF document text
    • http://wekitil.epizy.com/whirlpool_stove_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/usps_postal_indicia_guidelines.pdfIn PDF document text
    • http://kekosasokab.epizy.com/caminar_sobre_las_aguas_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b38d28-db61-482f-90b1-82a9b8ae1015/xebizivogepolurisemakaz.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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 5164 bytes
SHA-256: b1941d5725e6b876ab088cbd3eb8cb3fcb5082e0ad0ed3eab83277a7bc7e6d20
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10888 bytes
SHA-256: 3a4270af0eeb328db8c1ff062b7fa95ddb79017d12a88fd2d6af93f9f9bc2fc4

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