Malicious PDF — malware analysis report

Static analysis result for SHA-256 18686e54f38ad955…

MALICIOUS

PDF

78.7 KB Created: 2021-05-31 03:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5e23eaf1f308b1e4a56bf4a807e87132 SHA-1: cdcd11fe8c5b64e23b8e014aaa13062edc5d0904 SHA-256: 18686e54f38ad9555c8da9cd51c675390c0b16516c7da2fdf56d08516188a10f
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 pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=2006+vw+jetta+service+manual+pdf PDF link annotation
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/nutenugiku.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4501046/normal_60b171493c6ef.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/525f07370d5a6c7.pdfIn PDF document text
    • https://wotuvakarebor.weebly.com/uploads/1/3/4/6/134665633/vebojolejerivinidoga.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/letuviwefod.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/8d433c4ec96d.pdfIn PDF document text
    • https://terabawopezuxer.weebly.com/uploads/1/3/4/3/134364982/9228632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_603ff44af1f46.pdfIn PDF document text
    • https://tigidebo.weebly.com/uploads/1/3/4/7/134740117/kuvamaze-nukididox-gugekitaka-xojovakufigo.pdfIn PDF document text
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/0147e6c108d96c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_6037e1399d63b.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/buzewasipuvuvokujoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_605c6f6a5fcd6.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/7760984.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417138/normal_60b11f516d051.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/75c7223f-07cf-428c-9b70-5fba0c0e046d/infinity_gauntlet_toy_glove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a535fa60-f0f9-47b8-8b76-c4933e0526bb/dopakotirip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f29268a-7e65-431d-bb8a-c8c4f18af0b7/rothco_tactical_bdu_battle_dress_uniform_military_cargo_pants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730cc4e0-8a74-4d8c-8dcf-490c54c86050/43820046414.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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 5864 bytes
SHA-256: c67621a97320da44eb7f2760695cc0421ea920bb949501006031d50ec2ddc094
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10944 bytes
SHA-256: e40864b4ade5625e6c21e6f4ebb6dfca2775180ba5299b7cd82c698a860ff1cf