Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb6e5441bb47d17…

MALICIOUS

PDF

81.5 KB Created: 2021-04-04 12:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e6f83f42d1235d03edac79a7d41a9a4 SHA-1: 206ca6c581df4a48df51f42ca57e12153fa854d3 SHA-256: 9cb6e5441bb47d179d4253e64fcfd141d583ea4615e9e82b92201fd3c3c8998e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://ponafet.ru/strik?utm_term=veruca+salt+song+charlie+and+the+chocolate+factory PDF link annotation
    • http://mujoxoluvisukid.getenjoyment.net/lilebedowaralonux.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/jonakiliboxukuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/jjgc1eM/calendar_calculator_hours.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/lekonurexodumabajaronazi.pdfIn PDF document text
    • https://cdn.sqhk.co/duporetixi/gVtLI0A/bihar_masti_bhojpuri_song_2018.pdfIn PDF document text
    • https://gaxiworet.weebly.com/uploads/1/3/1/4/131408942/5ce4477391.pdfIn PDF document text
    • https://welaruno.weebly.com/uploads/1/3/5/3/135325412/8763455.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/marexasovo_xabemudawuzosi_sutisa_beduvojok.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/pozafagi.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/f5f5f549-aa25-44e2-bd43-50f4235af178/40283847926.pdfIn PDF document text
    • http://sakupoje.epizy.com/wobewuzurujojemumerabib.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_750976d33427470faa7cafff0f2cdd3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3c06bf-eb6e-42dd-a1a8-b4ffa3d4c026/what_are_the_four_original_navajo_clans.pdfIn PDF document text
    • http://rumaparulani.epizy.com/aprender_frances_gramatica.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_d6a5fd1ebace4911914c25c09f03bc6e.pdf?index=trueIn PDF document text
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_cbe02122391744d79e27af977b08419c.pdf?index=trueIn PDF document text
    • http://gomaxum.rf.gd/dorugotafuziziwuzuva.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_f810eb366a9c4cacb1fcb977b373dbf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cdf694-8dc1-4fb8-908b-996df508631d/nilomesi.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_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 5352 bytes
SHA-256: 5c364d19367a9c82f91b945f526c79477a5c4b17fac174e41c11195e1e4a3975
font_01_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 10864 bytes
SHA-256: cc06c3b09174628a915e5f8e0ce87321dac6b8e7ea1a05823f84c1176315b4d1

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