Malicious PDF — malware analysis report

Static analysis result for SHA-256 87799595634bee87…

MALICIOUS

PDF

83.5 KB Created: 2021-05-13 15:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2df29d796472d5bb6d2696fc3eaad9e7 SHA-1: 87689617682304111abb6e6f44119ba9ecd2b00c SHA-256: 87799595634bee878f4e83ac29b4934077445b68a972ffee602b6cfa86e0b47d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to creative writing prompts, which is then linked to external URLs for further action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://fokemale.ru/strik?utm_term=creative+writing+prompt+middle+school
    • http://vikiduxa.mywebcommunity.org/14284047910.pdf
    • http://kidiwutimako.mygamesonline.org/livro_blockchain_revolution.pdf
    • http://doucheapp.xyz/the_lion_the_witch_and_the_wardrobe_quotes_about_aslanwyam3.pdf
    • http://4gusevshop.space/blank_7_continents_worksheet3m4ec.pdf
    • http://kepukarob.sportsontheweb.net/how_much_can_a_writer_earn_in_india.pdf
    • http://wilitubejibo.iblogger.org/11729063471.pdf
    • http://didazema.mypressonline.com/why_does_my_chainsaw_stall_when_i_give_it_gas.pdf
    • http://moscow-siberian-force.online/garmin_vivofit_4_activity_tracker_black_white_s_m_bundlefxq20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_93fd3f6b68814ae196399e785313c741.pdf?index=true
    • http://jokilezitewoj.epizy.com/like_a_bridge_over_troubled_water_piano.pdf
    • http://kivekedifewu.rf.gd/bexumevimosag.pdf
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_1ab03d7a72c84d2c8ecbd818b8094f23.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_5a2b1ff125a54d1a9b69362dfcf6d1a6.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_d32fa956cad14fa18b7429051f5f29d3.pdf?index=true
    • http://juludiripo.myartsonline.com/jexelowadolezesevik.pdf
    • http://wijijatalil.epizy.com/koxebuwikizusineb.pdf
    • http://wokeben.epizy.com/miwaxipufupudalokad.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_e5eef78c26dc49bcbf54400aac5ef40e.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_807f705048c44ffd817a870414cdaf60.pdf?index=true
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_36bd7999514a4ac8a8a61fb687d101e1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc58.bin
43fa4239436eb601a4081ba3ca8718aa2f9492854a3b35a4cd36e2e949a6b934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 5452 bytes
font_01_sfnt_off00010ec5.bin
a99affb700d11cc8345fbba59cc53de705238c6958ff00d43b6ee0ded9debc53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10540 bytes
font_02_sfnt_off000132a4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 4324 bytes

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