Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7f976c9fbe0432…

MALICIOUS

PDF

83.8 KB Created: 2021-05-24 01:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 74c37fc44fd5a271932d1cf69bd3885f SHA-1: d24938b09c041689a2f13d1fb6b66a4608f5f6af SHA-256: db7f976c9fbe043230619dfa76c2d42fe71783442b9d37e48fa11a0fddfbfc98
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of a password-protected archive lure further supports the idea that this document is a dropper for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/strik?utm_term=power+bi+tutorial+espa%25C3%25A3+ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6009ccc8574a1.pdfIn PDF document text
    • https://bumudipokipilu.weebly.com/uploads/1/3/4/3/134350227/4837d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_606885a3ba479.pdfIn PDF document text
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/1755100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427086/normal_5fde0ed29d465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_605a2b9da3533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_60091e3575278.pdfIn PDF document text
    • https://nukewunokozekid.weebly.com/uploads/1/3/4/6/134678158/veliv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_6007cf5f4a9ca.pdfIn PDF document text
    • https://divulonuwuw.weebly.com/uploads/1/3/1/4/131482828/wewejujosuvaxet-romorifoxuru-lesona.pdfIn PDF document text
    • https://siduwibe.weebly.com/uploads/1/3/4/7/134775996/8409964.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/dd9cde6f-3bf1-4d71-bca0-cb204833c0ee/98687274625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb184f3-a97c-43da-a0ac-34df2a77f98e/61442796703.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/columbian_gold_tegu_care_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b215ae-6533-4234-ac31-0ebf6a2c097d/birenitixuwaneje.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/how_do_i_reset_my_password_on_my_cisco_ip_phone_7941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b989c5b-6eb8-4887-8a11-2737140d2d41/sepidumijinodelajefipalup.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/fevegudotinebevefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61821804-b5c0-40d4-8ac1-7220f2474afb/how_to_turn_on_logitech_wireless_keyboard_k380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6d5520-d5a9-44d6-810e-6c16032836f7/62384408599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d92403d-a6de-4f87-a457-1a283f22ebec/jiguman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49143470-958c-4faa-8fe9-e2fc8a2d4167/babupewaxofulazemakofomol.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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 5588 bytes
SHA-256: f4e9dcd4578f19b07bd789a6448e328c8b6cf1d299717f7902cd0ecbc5f4386a
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 17200 bytes
SHA-256: ae9c20c37e6d68268f39a8268119fc8aef4505f2a4a7637afc2af1e425d47a1f