Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ab02b266fd6f2b…

MALICIOUS

PDF

79.0 KB Created: 2021-04-06 10:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f729f9700942c3bdf5cf85dc378c89b3 SHA-1: dddf1e5702695f55e332b02a55b8b68f43738896 SHA-256: 96ab02b266fd6f2b020d540cdbb08f8a0f032c36b64d886ce4a35d6dd43e35c8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=attack+on+titan+season+4+episode+6+release+date+sub PDF link annotation
    • http://zuxuvikewi.sportsontheweb.net/asian_countries_list_with_capital_and_currency.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/jaterixeda.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/cisco_2960_switch_configuration_commands.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/daxemizifedikamu.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/42289963723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_d5a1def25b844c31a97b38e9a29a2e9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d04971-0f5e-4dfd-b9f5-065aa8b28e65/xojisogezelubojiwozokux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c47790-d01e-40bc-a20e-efdc31241d4a/jobudavavesovosare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5ec3ab-e547-4d76-91b0-1d7009f0f48b/bexabebalanemabumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07683c68-1d06-43b4-bf15-94d62dcea220/7614158378.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/vosidagimorofamiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/20575003456.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/converting_inches_into_feet_worksheets.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_c7cab319a1e2470cb8366d24db02d519.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_30859eb3062d4d34b08abc96721ab283.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_ab80db1ae85c438e9c9938f90a4b1a85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5104fa4c-9f61-4993-8347-a822dd636426/3183359093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3649d32e-bbbe-45ef-a82d-c6c17bbe217b/reflexive_verbs_spanish_activities.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/nomuluzedakakiravomak.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/how_to_install_diono_radian_rxt_booster.pdfIn 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_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 5500 bytes
SHA-256: 2274ec0765eee7db4712d2130494e89a066e27776bb9449e0abd65140510d55a
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 11112 bytes
SHA-256: d8d96f82f9c89a7b49943c19fe9c6e060fa1120caca3a0851ec373c4368fdd95