Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ad34c0ba10425f…

MALICIOUS

PDF

76.3 KB Created: 2021-04-08 22:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8aaf287c4cb8eb2ef880c13371c694b8 SHA-1: df7c54349cb9bc05b6b3dcf9d31afc0140ae82e8 SHA-256: e4ad34c0ba10425f195664834c2459bc571e5e51bbc27cc5491e462cc4841dcc
186 Risk Score

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 0.9997

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://zajinet.ru/strik?utm_term=do+vizio+tvs+have+optical+audio+out PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489422/normal_6018064be8889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_604dc3d0e3749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_600a4dfb22735.pdfIn PDF document text
    • http://padlamadla.site/coleman_tahiti_spa_replacement_partsv5cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_60548ade86bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_606642c0d4da0.pdfIn PDF document text
    • http://naturagrush.space/70639731040v2odj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffc00dfc18de.pdfIn PDF document text
    • http://shoop-fh.ru/battletech_mechs_by_factionx49ag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_603890d89cd52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6016e1e8c4cf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5fe54d3b26cf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_985c1d1c2f85439ca3f445b494a8cfd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e65cec-bf3d-4a74-a3fa-ce76e193754e/perowafojewozumila.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_13571399d9b747b7b1bbcc5083ee3f10.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_1423e9ec4df941e39347969de758b095.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bf954f-211e-48fb-9fe1-c6079495a8e6/48860567803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdf5d76-ed69-42bc-95a1-fed8a2d6cc76/2020_ssr_125_seat_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317f4246-11f2-4f99-b344-a52d2b1ad822/wavexaxobuwudatiloda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245bfd12-a0b4-49a2-bf49-8670bae32ce6/sturgeon_point_productions_internship_guide.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_84a39286b85e408db78548edc2cd965b.pdf?index=trueIn 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_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5172 bytes
SHA-256: f3f6a2707363380c085f24103be8b9a8784225995fc752cc36e9bdedfdfabb75
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 10972 bytes
SHA-256: 87d059448d0f613f5e2b02fb0abefc37ce99966d37a1bfc78fad694e0370141d