Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bb588613b8615c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-17 14:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 761459b9976848a4a9c1dffb2b3fed2d SHA-1: ccef8c394f5c63b20762da8f2cc70af1fdba5512 SHA-256: d7bb588613b8615c451ff57e9a7993b4975ffacb1359588ad363c0fc43f9eef8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain metadata related to 'Wyoming medicaid provider exclusion list', likely a lure to attract specific search traffic.

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://jottigo.ru/wix?keyword=wyoming+medicaid+provider+exclusion+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5fe4b8887f4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fd97d273277b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fca0586c96a5.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/veziduke.pdfIn PDF document text
    • http://sberbank.services/how_to_replace_harbor_breeze_light_switchegbyk.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/fisivupuvig-notilut-jezub-ramanugupo.pdfIn PDF document text
    • http://reduslimitalia-official.site/399912631293p1ea.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/43e38f65df4.pdfIn PDF document text
    • http://trynutra.shop/agar._io_hub_modded_private_serverd8s1f.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/8800788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5fdf3b9ebede7.pdfIn PDF document text
    • http://wide-do.top/mefanibawojikebunvl496.pdfIn PDF document text
    • http://rkconstructionsucks.com/nike_run_club_apple_watch_app_not_workingdx95j.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/4584950.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/9308561.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/71611638943shkck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 5636 bytes
SHA-256: baae29b02fe1cdcb0c900c0e6746ea6602e4631e38b910eed178be658d11981b
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 10660 bytes
SHA-256: c62ae85ceb8f09c9d2575db08947e4407f0403c1aa61ff8d30c6baac38fa9717

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