Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f1825f138365b2…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e492422817599a878d1752e510bcdbfb SHA-1: a3e61fe1ca068cedd8204864c2b80d24eb834a84 SHA-256: e6f1825f138365b24c1aaa74fee6cac87cac8986d21b948cd0b2d94fe59da89f
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, with numerous embedded external links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=teoria+conflicto+social+precursores
    • http://puvepum.getenjoyment.net/zuzinivala.pdf
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/vinadeku_gusokuwuw.pdf
    • https://jefelowomiwit.weebly.com/uploads/1/3/4/5/134599681/nafusine.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_600e03877f9a8.pdf
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/dae10ec49c6149.pdf
    • http://wifunagidoli.mypressonline.com/zetumun.pdf
    • https://bujubilefo.weebly.com/uploads/1/3/1/4/131406518/masilogoda.pdf
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffd24149179a.pdf
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/f5f07b047d250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a22cca75-cc8f-459c-9eea-628147015b55.filesusr.com/ugd/2f8a36_f135846f5ff34853a41b59544b39c7d6.pdf?index=true
    • http://vexabimumemig.atwebpages.com/wezekujimaxo.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_17f86d6bbd12415382e21e209e111a6d.pdf?index=true
    • http://xawezovixewija.epizy.com/pekotitaruronin.pdf
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_1ace58d25d3b4a50be60a5e7d5165e8d.pdf?index=true
    • http://jelexid.rf.gd/nanomaterials_lecture_notes.pdf
    • http://mawokale.myartsonline.com/georges_secret_key_to_the_universe_summary.pdf
    • http://petojijoxura.onlinewebshop.net/rokaxisad.pdf
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_00d6166dc84d49e7b392c9f0e7ca7d83.pdf?index=true
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_56f9fd7e9196491284cdc9eb986fe04c.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_d8f28878fa0c4bf68c90e72fe9f5f690.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_91ecd6555ea14272b9354761bb87e642.pdf?index=true
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_009935e769834862828d3e67f3c3acf6.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_off0000e9d5.bin
bb4553d00f2a773fe3dc8fd9b1b5dbc613576cbc7ef6fb28f59d089562943543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 4956 bytes
font_01_sfnt_off0000fac2.bin
6c48d39893851edd336d3db09f8828c659d70b4e94d25cbabe92a12243b13a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 11468 bytes

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