Malicious PDF — malware analysis report

Static analysis result for SHA-256 609d78682600efd2…

MALICIOUS

PDF

74.1 KB Created: 2021-04-03 21:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a7e4efd419fbd362c40e9167535c38 SHA-1: ff8c53f67c93fdf1427b05ad3a4229f5165dc138 SHA-256: 609d78682600efd28a3b26af9dac1febe097b27841be66fecc8dbc002933c45a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, forming a link farm, with many pointing to other PDF documents. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is not content delivery but rather to host or redirect to malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://jakufodunod.getenjoyment.net/rusirive.pdf
    • http://wimixolumow.iblogger.org/82415897907.pdf
    • http://gatofupimekow.mywebcommunity.org/gawewiluzivemulibekedajoz.pdf
    • http://sajiwurejedetu.sportsontheweb.net/lista_de_verbos_regulares_en_pasado_en_ingles.pdf
    • http://zisuroto.mygamesonline.org/63113933063.pdf
    • http://xuzerujagojagip.scienceontheweb.net/bioreactor_parts_and_their_functions.pdf
    • http://kaxiwemusemoj.mypressonline.com/sample_job_acceptance_letter.pdf
    • http://bekopomulasebi.getenjoyment.net/72516026233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=metal%20gear%20solid%205%20unlock%20female%20character
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_d56e773f82c642cc807bf12b80285f0d.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_0baefb2a14454865bbc4020cad2ac8d5.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_9b946a5dc9c14567b520d0cdcb239c19.pdf?index=true
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_f047cfab49e7497abd854ec54299fa5e.pdf?index=true
    • http://kagomovibinat.rf.gd/82497101817.pdf
    • http://godusisoti.onlinewebshop.net/22219358110.pdf
    • http://fatowulur.epizy.com/tadurudofotuzirik.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_23a45db26adf4138a12e67731500755f.pdf?index=true
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_0149c9a6ad3f41be807761bb6f967aa4.pdf?index=true
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_7adbcdcb9c6a48fa8a511ef826abe2db.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_off0000e179.bin
fb05141320b440811b39e8615a0a2851bc05d9802063d1b6656a32202d52e92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 5628 bytes
font_01_sfnt_off0000f492.bin
6c4b7d0d8ce1e3bf24a55dc10a15741b2335394bda4873b7414d81478e8244f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 11336 bytes

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