Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04c5c19b124a30d…

MALICIOUS

PDF

71.1 KB Created: 2021-06-04 17:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41bbf7b2bd47b8d64be300f972b1c451 SHA-1: 12ae27e546d42cc4c6426281789dfdf49d629703 SHA-256: e04c5c19b124a30d10622741240a8bfc8ecb6e07d06500a7b8a0c1728fecd147
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://inwebjor.ru/pbw?utm_term=pokemon+heartgold+ds+rom+hack PDF link annotation
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/neketop.pdfIn PDF document text
    • https://jidukuroji.weebly.com/uploads/1/3/4/0/134013204/ruriviruwezudoligoju.pdfIn PDF document text
    • https://vifinijeg.weebly.com/uploads/1/3/4/4/134479412/zojizukagofan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4045d3f-6c52-4c41-b329-05d48cf63607/kowoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e898c079-431a-4e12-9127-f8b991845c46/24568328349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da58018-7ca7-4347-8d26-446bfebb0ff1/94663911859.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/25669110508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0204e7-38aa-418b-875b-b981f68e883e/the_worlds_easiest_computer_book_reviews.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/madulug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfff56b-3a3a-4dba-a068-fa1a9917983b/angina_pectoris_pathophysiology_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2607e3c-20fd-431d-a0e6-6493be364363/xipubunujokomigukipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1f61a5-a39c-4bf0-bf46-6ba7ecf14786/seduwezaperumu.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/25304575315.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144512910/26743277665.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144446919/zuxozuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb250aed-ed0f-463b-a73c-ff228d48c387/fetebatupabilipoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9031d18-6df5-4619-962d-19e6e5c54748/rivoguxav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00de504b-1e6b-4158-8391-86d893f5bed7/how_to_know_if_water_pollution.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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 5420 bytes
SHA-256: 1d36c001ed7404d4d28e5de208ad606feb619190938b92eb776ff784c777851a
font_01_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 11312 bytes
SHA-256: 59847254dad8586181ea80fd3dd33ce18ca0fa6b71eb0aeafeb6e34334599f6b

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