Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8300ad2f90ae48…

MALICIOUS

PDF

94.9 KB Created: 2021-05-04 22:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88796e9da7d7df9f5c2e5eb40c046a32 SHA-1: 72159893b37965fec6efb42495ab91f2a62a940b SHA-256: 8d8300ad2f90ae4812164274650ee6c320c88988cb7a08d9884b41f0221f994e
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 0.9996

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://botokaw.ru/strik?utm_term=distance-time+graphs+metric+answer+key+pdf PDF link annotation
    • http://cosmostil.top/bongo_music_videos_mp42ejmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_6039fded39ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_601bc54bcd06f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_6034691561612.pdfIn PDF document text
    • http://scrlt.xyz/mongoose_dolomite_fat_tire_bike_manu6e89c.pdfIn PDF document text
    • http://nubolats.xyz/body_planes_anatomydc2x0.pdfIn PDF document text
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/kerudo_pepaveju_lubures_zokel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fde3bba6da09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_603d0ef7a5610.pdfIn PDF document text
    • http://s7hmus.org/tigobadelebnfuj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_60628301ba539.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/et5jiqz/18842180974.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/nafokide-zopadulinokejo-firowatibodiliv-powodarunibu.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/hc8iSom/39723395253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_6055b19cc2475.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/hi44hi1/81650438823.pdfIn PDF document text
    • http://com-connexion.xyz/52374110737gu4ns.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/0cae9d52-6692-4c92-89b5-474e6022a15b/22649392162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b81856-63d1-4c77-b581-382380cd879c/71932117419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2c819a-c23e-4d7f-b2d6-c3ab26123751/gagilosurewamofinod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656e5506-f3b1-484c-8e5f-5b10d67d82f5/22347582192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0477b1-cfdd-4ea8-b78f-cedae5a3b045/56791529223.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_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 5828 bytes
SHA-256: ecdbc3e3d1446e82999c36d7856acd43adb9a1c8e1006bbb06550e7d3f476718
font_01_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 12340 bytes
SHA-256: a408d6e99186ad372c0ff9b6ac43ffb753cdc7c220669798f4dc93c5a931b268