Malicious PDF — malware analysis report

Static analysis result for SHA-256 509bca0d43ba0f34…

MALICIOUS

PDF

72.4 KB Created: 2021-03-04 00:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0dc575199813f359adbbad4bd81d0ec2 SHA-1: 52f53757c875b3ab7ad4b560de1c5590d3c8663b SHA-256: 509bca0d43ba0f3488316de64469404999a6226cf02a39ee2b6d523e12ba5ccd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://lozipotod.ru/strik?utm_term=easy+classical+guitar+songs+tab PDF link annotation
    • https://cdn.sqhk.co/zezinojox/hbgdzQ4/fitilotukowofixilulumu.pdfIn PDF document text
    • http://akmurzina.com/wedijixiwuzenasopxo9v9.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/29520919938.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/54854227337.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/web_services_definition_language.pdfIn PDF document text
    • http://copyrightshelpscenters.com/renaissance_crossword_answer_keye9o89.pdfIn PDF document text
    • http://carinsusa.info/wekugotilorud5g186.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/nidijwV/84897049842.pdfIn PDF document text
    • http://espaceabonnes.com/yahoo_email_for_android5srrp.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/67315255653.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/gidavomijejatuvapofax.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/erogggg/fatibubabelewaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387811/normal_5fde3b1199641.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/xukirizugukugi/93745909121.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/41312350356.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/japanese_encephalitis_patient_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/what_is_an_example_of_positive_and_negative_reinforcement.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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 5168 bytes
SHA-256: 6cb4d1b8bb8812aace8f573683ac60e92c589011beb432ab24dd0f6da1d44377
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10784 bytes
SHA-256: 566f93b8d70db94d9f4be68b854c44a46f84bef192a981140c82ad608560a600

Open this report in the interactive analyzer, or submit your own file for analysis.