Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb23af5112a24e8f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 09:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3108b45f5d5496cf2eaae6b9032ddbc SHA-1: 65eac53b984eee5c7624a7677fc80fd971dcb75f SHA-256: bb23af5112a24e8f536009cb8fd8e2c3ead5e209c7f0c460e89a7b205079d83f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' reveals a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. One of the primary external URIs points to 'https://druttle.ru/wix?keyword=grimm+parents+guide', which is likely a lure to attract victims. The document body is heavily obfuscated and unreadable, but the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics strongly suggests a malicious intent related to link distribution.

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://druttle.ru/wix?keyword=grimm+parents+guide
    • http://janipuwibir.mywebcommunity.org/journey_to_the_center_of_the_earth_1959.pdf
    • https://cdn.sqhk.co/medijamowole/iaGOhgd/beginners_fitness_plan.pdf
    • https://cdn.sqhk.co/kovixileta/TMjdagf/28201080196.pdf
    • https://cdn.sqhk.co/xororasomig/iyngjhe/99158457058.pdf
    • http://rotixumuzu.22web.org/50485899124.pdf
    • http://xuroriwonufuz.scienceontheweb.net/35905438701.pdf
    • http://fumatiw.mypressonline.com/57622510303.pdf
    • https://cdn.sqhk.co/romilononove/jhF4jao/jurassic_world_the_game_hack_tool_free_download.pdf
    • https://cdn.sqhk.co/sovokeduseb/WOySNXl/tokyo_olympic_logo_png.pdf
    • https://cdn.sqhk.co/mugolino/hdjegiR/zinalatajenukitisomuxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dowinoxerirud.epizy.com/bakelite_sheet_pakistan.pdf
    • https://s3.amazonaws.com/jijumupade/kathi_tamil_full_movie_480p.pdf
    • https://s3.amazonaws.com/dupula/jagilegezuxedomisuvaf.pdf
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_63f97d1c54874b2f97387c5009589692.pdf?index=true
    • https://s3.amazonaws.com/jedobufudajewu/43504101805.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_d8d079229f814ad18d51b8563cfff1da.pdf?index=true
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_bf29d3f6c51d483199b2ce6f840f3df1.pdf?index=true
    • https://s3.amazonaws.com/tasufagijaremo/remote_control_android_device_over_wifi.pdf
    • https://s3.amazonaws.com/bisiku/55704918001.pdf
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_74059bbe9f3a4054ae7cf5cbde3e70b3.pdf?index=true
    • 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_off0000f34c.bin
679fcfabe07d955a173e0eab86a240d4be2e36921eca608467d54d6d5bc790a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 5276 bytes
font_01_sfnt_off00010522.bin
b637437e5475b3391c7ec674512a6878f8c40ee69838acc72812fb72f5a26598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 11024 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.