Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df17fdd6574438d…

MALICIOUS

PDF

107.1 KB Created: 2021-05-14 20:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a5155d6ed10b0d370bcdbf5aaeddd084 SHA-1: e3f4deb5c514f8d0c84bc5bcb3c836d9f17fe427 SHA-256: 8df17fdd6574438d14cc7cd5f9dd245ac8cf13511462ca83557570c79cb40ed8
194 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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=navy+seals+weight+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fe66576f1048.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/hcAiegg/mini_golf_cart_cricket.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/enjg7gf/26852921449.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/93641740335.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/lavigader.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/xugifufunex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fe0044063dfc.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/fesirojajimula.pdfIn PDF document text
    • https://juposuwidamad.weebly.com/uploads/1/3/1/4/131406248/fabibebawaju-bufaboxitupaw-jorud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_600e223a29609.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/ghso2yo/lefupejezewifafubuvikus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5fcc8d7fb6644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60694cd0e6901.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/FBMHZij/final_fantasy_tactics_switch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_2d49015b87404be3af48ca03e49764cd.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_9dab1ccb2f514e2e9b0d4de39d791d25.pdf?index=trueIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/baldor_algebra_solucionario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4f8cab-50f8-4951-9e33-db6547930223/network_and_computer_systems_admin_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c418a4d8-21bd-45fc-bfab-2034dba8125e/zagoz.pdfIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_fab46b3b3a45479196f19127b8a1afa4.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_6639dad71c454620bbb59f642f62dcba.pdf?index=trueIn PDF document text
    • http://jukasuxoseki.atwebpages.com/78481808461.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_ea6377b3b7134d0e92aa2f7477b2e9a6.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_off0001680c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680C 5284 bytes
SHA-256: 2a1fbdd7a0d47daa055b5633008f671474544df85e580c5cf8ce1c2bbdbd5b6f
font_01_sfnt_off00017a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A21 11016 bytes
SHA-256: d12f3852dbea7d2b6c7f0508590957ba9efc0b48a8b68fac515da9496ff8f019