Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a48287c29b1bd9…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 05:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: aa92f123dfea7e5b4c9a1a4390f2ddfe SHA-1: 987e84c167452e8b5eb20def0a15f5f1ad07f44d SHA-256: 51a48287c29b1bd9e56c24e8e73f327b9c16a71ad1983f32cb5dfd09b7e719ff
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=kitchenaid+khb2561cu+5-speed+hand+blender+manual PDF link annotation
    • https://nasebawesor.weebly.com/uploads/1/3/1/6/131637432/lewudur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_602c5cd1b1223.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/solomon_biology_free_download.pdfIn PDF document text
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/d44d0.pdfIn PDF document text
    • http://help-copyrightservice.xyz/493344815240wkg9.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/bgexfHm/94181088426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_6012836686a0e.pdfIn PDF document text
    • http://1-bog.ru/bekuzuxolutexomujozedotaw0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_5fe9cb0e9731f.pdfIn PDF document text
    • http://vizionsmc.net/29189014521wryzy.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/jjihdjc/givasiw.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/chgg5SR/57553962494.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/sebux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koriwironawuva.myartsonline.com/doctor_zhivago_2002_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c525bf-b076-41f7-9982-1797eadb7a17/niranoxelojupuridefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9360e7-df5f-4413-be78-c8211f95d705/define_reliability_in_software_engineering.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 5980 bytes
SHA-256: f930f6ead1b01ca6a1e47e176ca62404769b57671c8d9ea07da2145fcbb7d1d2
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10932 bytes
SHA-256: 0ad643eaffbefadcc8d21e62ec24334e3bfa3ff778449feb7c60b3dcc684bfb4

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