Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5d533ca7ea84a1…

MALICIOUS

PDF

97.4 KB Created: 2021-05-25 13:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d1310adf2d6150b3cf78dbb75d33b174 SHA-1: 2880f9a8ed2fc3811ee0dfc6b5befa256aef8102 SHA-256: ea5d533ca7ea84a18ef28e882f6e7138c5ae07e2d670c02d79a89a057b9da1d5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=how+to+heat+archer+farms+ham PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486060/normal_5fd2f463ddd18.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/xajijobu-musosezot-riviwagosopuji-xofad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fd1157e46d31.pdfIn PDF document text
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/zasifatofulumitafe.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/libenowowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_606331f9b9156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_600fbd794f8b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fc9fc175ae48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5ff69367dad5a.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/c21402fd24f.pdfIn PDF document text
    • https://vexuneka.weebly.com/uploads/1/3/4/5/134584550/301269.pdfIn PDF document text
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/nufawumobu.pdfIn PDF document text
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/vinarakisixizaw.pdfIn PDF document text
    • https://werukubafufu.weebly.com/uploads/1/3/4/0/134000234/5713555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_603085a158823.pdfIn PDF document text
    • https://faniwavuguvupos.weebly.com/uploads/1/3/4/4/134478403/a83af3c.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/34fc7c9004c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_60674306df75f.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/molem.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/7308182.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/91a36e05-aa67-4d1a-bf72-85306cf0a5f8/dyson_dc50_brush_bar_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3766b8-a22f-41d5-b89c-68d83a8afb20/what_is_the_british_army_mission_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5985fe4f-d0c8-46c6-a7cf-b7ddbad6130c/63729672940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ce0f02-2021-48c8-ab8d-0c38a97c81bb/31890034578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f83a36-da1a-4c35-81a2-cfed4c00b532/where_are_the_land_of_stories_movie_auditions.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_off00013ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 5144 bytes
SHA-256: 37398dcdb8f2543835cac9f7ece466f92ac719429dd163ee32bb28fdd3169049
font_01_sfnt_off00014e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E46 12380 bytes
SHA-256: 5cb2bed61ca796c8766e95916eeab5661eb37d1c67753f447e0c6f1a34ef89df