Malicious PDF — malware analysis report

Static analysis result for SHA-256 19396dab99a2d8cf…

MALICIOUS

PDF

70.0 KB Created: 2021-05-15 18:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 66aecd439960e3a5bb58c68febe9aea7 SHA-1: 5865ee03e019ee85862c3c44c3c4ba8465e92e16 SHA-256: 19396dab99a2d8cfc5de62c455e1a2703e714e398e79659b3ae7bead536647b7
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 0.9991

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://vilenefex.ru/strik?utm_term=what+do+you+say+to+someone+who+is+stressed+out PDF link annotation
    • https://dujulofenali.weebly.com/uploads/1/3/4/5/134587776/6116595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5fc9c3a87d789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_6002934284707.pdfIn PDF document text
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/setidavaparafis.pdfIn PDF document text
    • http://setifol.66ghz.com/which_companies_are_iso_27001_certified.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_6051e727a779b.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/asus_aura_z370e.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/3486370.pdfIn PDF document text
    • http://nipodek.22web.org/causas_del_cancer_de_esofago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_605e1251d9581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_6014e6902752e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409992/normal_5ff047875e77f.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/4555465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/18460267976.pdfIn PDF document text
    • http://tigujibivafe.epizy.com/21012721014.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_7e6fb4fae78e459b8c19db2b0378a691.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_f7c592360d714b6fbee3e03b3ff0a214.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/85271271386.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/who_does_prince_caspian_represent.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_a1141ab7f04643bd88b1672fa882405d.pdf?index=trueIn PDF document text
    • http://rusireges.epizy.com/bimmercode_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/crazy_in_love_beyonce.pdfIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_52c5d90137d94824b859bfb26f3541af.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_f949016eaddb4c64b8f13b124fe3bd2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/tabojarabewadolagepun.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 5240 bytes
SHA-256: 83babd75af34bd121d8d3e1899fbb078808d90c1e60855dce5a39b1a43688a6a
font_01_sfnt_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 10372 bytes
SHA-256: 3093825bd0c3fb150d52acab2ec2d9750176bde3b4b06560dd0cf90595fa8cdd