Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d96615d98c6c366…

MALICIOUS

PDF

74.9 KB Created: 2021-03-22 04:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ccec9ecdcb7040e3ab5fc944fdaf54ca SHA-1: dc0c77972425437c52d591675ac912de87f07221 SHA-256: 8d96615d98c6c3660332ac2333e523d0ca46936c43aa80ea23fbaae44b60af09
126 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 high likelihood of malicious intent. The presence of numerous embedded links, including one pointing to 'kuzutuzo.ru', suggests a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://kuzutuzo.ru/123?utm_term=advanced+cfop+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fe11a83e919b.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/2020_vw_beetle_owners_manual.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/bejusoxuvosi.pdfIn PDF document text
    • http://xovuwut.iblogger.org/luronanem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_5fe856addad0c.pdfIn PDF document text
    • http://4gusevshop.space/color_tunnel_2_unblockedftamm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_60224d21985ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_600b91049ee1f.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/dunkin_donuts_bacon_egg_and_cheese_bagel_nutrition_facts.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/how_much_does_a_union_pipefitter_make.pdfIn PDF document text
    • http://lngcliente.com/30342527179he7kt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450147/normal_5fdee144b3dfa.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/50631299586.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/wadoxubumamojufuboberer.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/pengertian_neoplasma.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/dave_ramsey_financial_peace_workbook.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/le_libralisme_communautaire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_e7569da982184cf6aeb9934cfb7d2780.pdf?index=trueIn PDF document text
    • http://zepizevut.atwebpages.com/bewapidifenodowovupufeno.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_8f4d426368fa4926a6d5b8ba557606f9.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_7363ffeb56414687a3dda32fa41833d2.pdf?index=trueIn PDF document text
    • http://bujoraz.rf.gd/xowawifigumadunu.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_2727d6d773ec4146b03237c535f55e3b.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_dad9205629b547009f564eef78d186d8.pdf?index=trueIn 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_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 4892 bytes
SHA-256: d8d8a8069c69aafe3c5ac104f8c82ffc6b89a50ead39373c3b1884ef26b5cd0d
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10648 bytes
SHA-256: 22dbcdaec731df542850c54e931383f4cfc4c6e3426d3c26e5885260aeb86b8e