Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f87879910a605a…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 05:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aece610335ddcf14a15415c87c6fb6de SHA-1: 583e0ee6c084944301126e16f1095273d190b724 SHA-256: b3f87879910a605acbdfc4dbc14fb8efa208be9aa984e5aea38d2e4f6c16bd23
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of numerous external URIs, including those that appear to be part of a link farm, strongly suggests a malicious intent to redirect users to potentially harmful content.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pelibifir.ru/strik?utm_term=perry%2527s+chemical+engineering+handbook+3rd+edition+pdf
    • https://cdn.sqhk.co/navotezive/KjhtjkH/neburilupufawinuja.pdf
    • http://lakaxof.iblogger.org/92950324745.pdf
    • http://sesizuxewewax.mygamesonline.org/fomipodufuzovap.pdf
    • https://cdn.sqhk.co/lisupixiwe/hfphcgh/moralsk_karakter_kryssord.pdf
    • https://cdn.sqhk.co/ruwopazeg/asAjiZf/bus_tracker_app_in_android.pdf
    • https://cdn.sqhk.co/zajujinul/hejbokr/dynamixel_xl-_320_arduino_library.pdf
    • http://zivufomureko.22web.org/zuxapuguwek.pdf
    • https://cdn.sqhk.co/pijajawopoji/ghkihgf/world_cup_penalty_2018_apk_mod.pdf
    • https://cdn.sqhk.co/mapiwoda/gZqzRBt/street_fighter_movie_2015.pdf
    • http://donuliwobem.iblogger.org/metal_roofing_sheets_dealers.pdf
    • https://cdn.sqhk.co/motakolilo/Whg2yjj/arena_stage_theatre_washington_dc.pdf
    • https://cdn.sqhk.co/jebuxanit/gjorF60/curly_braces_in_format_string_python.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7c85e96-19a4-4e9f-9d34-d32ebaee203e/jolidedezi.pdf
    • http://bumurulepowele.myartsonline.com/types_of_language_in_nepal.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_bbc87061676241aea24ad7c4cd67c4a8.pdf?index=true
    • http://siniligavaxuvul.onlinewebshop.net/rubatutugapoguwagog.pdf
    • https://uploads.strikinglycdn.com/files/297c1782-33b6-4eba-9d02-2da917c5c1ee/what_is_the_net_cash_flow_formula.pdf
    • http://mifotabelimudon.myartsonline.com/achilles_tendinopathy_exercises.pdf
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_de40ac3721074299af44957603426ee3.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_off0000e4b4.bin
0f94018e169dfc51ccd937ac84cd69eb86883bb2b13f89f76517eb886098a75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 6076 bytes
font_01_sfnt_off0000f93f.bin
30ffaff2cb15aa9ee136a50c92f76b4cef6bea1814bcf7e7fe690ee1967ba9f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 12232 bytes

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