Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b16e00650ed627…

MALICIOUS

PDF

106.6 KB Created: 2021-02-14 23:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6a2aff2cee458e8af526c3dafb300748 SHA-1: 2fffa10abc40aa00ff4a85f709f22ec58aa5c6f0 SHA-256: 10b16e00650ed6274202353c718a9e621fef5e64210aff28ff3fb5f01daea5b6
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm designed to obscure the ultimate destination. 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 heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=how+to+teleport+players+in+minecraft+using+command+blocks PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fc66edb4f917.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/jufop.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/zedubojokabeja.pdfIn PDF document text
    • http://krokoboko6.xyz/galaxy_on_fire_2_hd_all_shipszkzyl.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/c21399741e6f3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_6028158e36a8e.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/jinudamozodirid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_5fd77637013ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beralopijabeziz.rf.gd/lasojalanuvadovepilo.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/pusorovumotavukular.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/69417008188.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_off00015f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 5836 bytes
SHA-256: 512ba581e6c37de240c0b34ce52a94709b5f1e540b8fcbd17230a1f32cd32334
font_01_sfnt_off000172e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E4 12900 bytes
SHA-256: e167e640136e52453a3da1f718cb198885c747fddbda023642853e2f32cd53ae

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