Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03f53b500313ac1…

MALICIOUS

PDF

83.2 KB Created: 2021-05-27 19:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b44fb2e6196e107155bcf0423f89fb71 SHA-1: bd2a2240b81da26e2f5f81f8d874e3c312d6b40a SHA-256: d03f53b500313ac1e8fba2d8d6e2fd3d6c74f9e4e272a1f550ae0b0c45b0fde1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://leonvi.ru/strik?utm_term=what+is+after+we+collided+rated+uk PDF link annotation
    • https://ravusosu.weebly.com/uploads/1/3/4/5/134589623/felule_gijoredafu_jixoposeveb.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/9727755.pdfIn PDF document text
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/29df6337ac7ea34.pdfIn PDF document text
    • https://duvokazi.weebly.com/uploads/1/3/4/1/134108747/1821334.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/7188581.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/8fbda84d.pdfIn PDF document text
    • https://zojunakalej.weebly.com/uploads/1/3/2/6/132682915/gaduzaseli.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/cad0bad15e0.pdfIn PDF document text
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/df672d.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/sixewitu_jitenuko.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/3408137.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/facd93a264.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/4e7e718a-bf59-42c2-aba5-b25c6385322e/how_do_i_fix_hp_ink_system_failure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fceb31-a66f-454e-9beb-ce6a2c65833d/23574420626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc63fc6-9ffb-4bd0-b962-30ef7115d302/nolizapoxexerunuxukugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28632bbe-1340-420f-9e11-ab28439c7262/23340406599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0768bd-114c-4a76-8d75-48cb581b19b0/44310892022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94664fb4-0c12-4852-a8b3-16dbbf92f663/tadumigisem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52342c62-02c9-48e9-9e58-5b38d72d847a/toxije.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 5280 bytes
SHA-256: 7e598d61324d1ac4f0116e8591b409a2ca95e748d98fbae7597ed4c47a65b780
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 1884 bytes
SHA-256: 2295a5257a40a42de0eb1b549152a3f505a4a607b2b6ab12771f12fd7d537ed4
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 12104 bytes
SHA-256: 28dd56c27b415ac992a70f2ed888b5e502fde548dd73308d90ab19877ee67bb5