Malicious PDF — malware analysis report

Static analysis result for SHA-256 68507ff09433cc1f…

MALICIOUS

PDF

79.7 KB Created: 2021-03-24 22:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 87eb5992e628ace39e9560e022cd25fa SHA-1: c3d813ba6421f29e10b421fdca3cbc722ca71735 SHA-256: 68507ff09433cc1f23eb558bccb6c736abfa5dfc3c5ce60a0205de865f7040f9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to exploit users through deceptive links.

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/strik?utm_term=citizen+eco+drive+e650+set+date PDF link annotation
    • http://cleanup-sale.site/81615809312e0f3s.pdfIn PDF document text
    • http://baby-slings.ru/avira_phantom_vpn_pro_apk_mody9749.pdfIn PDF document text
    • http://rerubin.space/craftsman_17.5_hp_riding_mower_batteryhkqpt.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/kopekikanoximpqmk5.pdfIn PDF document text
    • http://lujogaw.22web.org/corso_italiano_per_stranieri.pdfIn PDF document text
    • http://wubopabezijoso.22web.org/76957886461.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/80d066d3-8709-49ab-86ee-e8f0b3d8f6cb/kozagekobovizetofezizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b49f0a9-0ac6-45e6-9fa1-b7a9becffcb3/the_shack_movie_online_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72667f5-f60a-4506-9074-7a9916075948/33641144857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38c211f-5d11-4208-a9f2-babd50a75fb8/holy_name_bible_download.pdfIn PDF document text
    • http://takoxiwewol.epizy.com/paramedic_drug_calculations_made_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2400f6-2023-45cb-aa51-a376168cfed0/90359606861.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_53715066d8664dc2b7beddfc2d15673c.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_12261e57b7644d1d9658ba1364a2440c.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_eec27bdd5822455b97caeebeca962934.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d96e8e-06c1-4885-9ebf-79f34688bd3c/what_is_the_most_popular_songs_2020.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/zemuluvixixal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30bb9ee-9591-493c-91f0-a6ab53d2e951/levuwokupop.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 5336 bytes
SHA-256: 91e081b4fed64c5c8c39c1e5c23874cec1134974ee0a246c628e98c0b9bc7653
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 19244 bytes
SHA-256: 6a5340b79fa6f4c553e073802977ba3f3fdc34a858cfcb8d406f5dd6c4325a4e

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