Malicious PDF — malware analysis report

Static analysis result for SHA-256 8342c7ed42148097…

MALICIOUS

PDF

71.3 KB Created: 2021-06-02 21:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 46386071921fda103fd9774e0dc0063a SHA-1: d91bb8b91ba8fcfebcccec494f84482e445495fc SHA-256: 8342c7ed421480975a19ff6e4243e9068d714397758fc527071e6ec68f07285e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on `https://krisoc.ru/pbw?utm_term=katja+schuurman+bevallen+instagram`, suggesting a lure to a malicious site. The document body, though heavily obfuscated, appears to contain metadata related to the URL, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=katja+schuurman+bevallen+instagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427079/normal_602ec0b419615.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/gufomobagutebogizi.pdfIn PDF document text
    • https://dasitonaz.weebly.com/uploads/1/3/4/3/134379343/9402539.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/lojisivumimakud-jukubewuvagobon-balav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fc8e90d8199a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_60309ef9e8734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144422763/vojir.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144418224/dupojojelipasu.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/wikuduzakomazata.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144515406/49391213920.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144422601/34883525665.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144471846/what_is_the_importance_of_ethics_and_morality_in_human_life.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144500184/mavaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d7c207-fa30-430b-bcc2-d464fc2d4025/24367071804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc7c148-3c18-4f5f-887c-7c6bf837a2b3/vurinujifomezabijepazakix.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/ditojusabumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef00389-0847-46b3-a34c-bae3622cad60/tisosonakemekifidexiwo.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/35701346723.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/neluxadutepokoxemebar.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5456 bytes
SHA-256: ed6ab8384ef1f75d1ca3e84527591e9e04a41aaa1feb2d7f0818dcf87f72d293
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 11680 bytes
SHA-256: e90b582293195fba63b6673fd846e19cc62107a4b471a39c4a7a76a2492f54f0

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