Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3951e5c3f6d00db…

MALICIOUS

PDF

114.1 KB Created: 2021-02-23 07:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ad17a00d1f73e4bd05978c3a5f81e826 SHA-1: be3b3a8f095d645c7b7ba0130adf0b10ab85a9c7 SHA-256: e3951e5c3f6d00dbd1ef5c664383a484ef2cb8ad1546ac3187ccea3bfbefc0e2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious or disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://baarspo.ru/wix?keyword=doom+instruction+manual+pdf PDF link annotation
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/e0c7055b.pdfIn PDF document text
    • http://savozotob.iblogger.org/v_for_vendetta_imdb_parents_guide.pdfIn PDF document text
    • http://zefedupawomodos.22web.org/actinomicosis_pediatria.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/2649528.pdfIn PDF document text
    • https://kuredebe.weebly.com/uploads/1/3/0/7/130740483/zalome.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/dusimoxuga.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/didejowa.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/wilixewomadaw-delajurom-ferat.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/36f24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palojolasorut.rf.gd/freeman_guerrilla_warfare_unit_guide.pdfIn PDF document text
    • http://xikisefux.epizy.com/sql_server_complex_queries_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/hemostasis_definition.pdfIn PDF document text
    • http://katujomun.rf.gd/tartarin_de_tarascon_en_franais.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/catalogue_oriflame_mars_2019.pdfIn PDF document text
    • http://finuximiwogum.rf.gd/beautiful_flowers_background_images.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_off000177f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F1 5300 bytes
SHA-256: f20474786b734e35cfcc150f0d7c182c26531e6ca5eea354815a51c788784602
font_01_sfnt_off000189e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E8 16212 bytes
SHA-256: 62cc7da6deb58fd56fb7ab526da6b0e6aec7da4e2bb0d159b92e895d88f3f47c

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