Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82bf09d54a5434e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 02:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e6f79e62212256eb9139ab3f1d3f705 SHA-1: e6422061ba26e644e8bf9b04586cc1b9a567f5ca SHA-256: e82bf09d54a5434ee20d04016effab02744797a38b588542d87a115334efb279
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and includes a 'how to use a pocket star finder' lure in its document body and URLs. This behavior is indicative of a link farm or phishing campaign designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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://jottigo.ru/strik?utm_term=how+to+use+a+pocket+star+finder PDF link annotation
    • http://logvoz.ru/ma_english_literature_jobs_salary_in_indiazmxuk.pdfIn PDF document text
    • http://dudisukogonox.iblogger.org/40696494881.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/eureka_the_boss_superlite_manualr1vaw.pdfIn PDF document text
    • http://poverkavoda.website/wildlife_animals_videoi8327.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/kanufabomofufirajuni.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/wizavunas_jorif_gudozon.pdfIn PDF document text
    • http://pogadai.xyz/24557723822j3iuz.pdfIn PDF document text
    • http://webdefilmizle.com/ruvunujorezuz9w1d8.pdfIn PDF document text
    • https://nakefofomiruni.weebly.com/uploads/1/3/4/4/134483242/9871210.pdfIn PDF document text
    • http://poxexududojal.66ghz.com/rekanawineridunam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_10ab389f8a6b4410ad6f1a851f0952fd.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_6588aae9ebd241aeb0b954b46059c364.pdf?index=trueIn PDF document text
    • http://poxemibusap.epizy.com/27124310164.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/tolajox.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_a4e6456f9e344f6ea4482159eecd2971.pdf?index=trueIn PDF document text
    • http://lolevejejiwi.epizy.com/wimonoluzibunoxosoj.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5232 bytes
SHA-256: 2adb6aec77f6a48067d90bcd5fd897a4ebad2c7420e89018d01c44077613472d
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10444 bytes
SHA-256: 7ee80b9e04002e8ae8501b8c3a088ee6ab41734cd17220cdd2a39af9a02e3d19

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