Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03b3b30b36cca4c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-02 22:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe9bede4ebcd0e22284ad41b04592cc1 SHA-1: 774f6fd65072875f04a29b81dd23a9b928df033b SHA-256: a03b3b30b36cca4cd052f6f596cf01eb1f839822a7716ef5763ad2f9303ebc94
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs suggests an attempt to redirect the user to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=robin+hood+movie+disney+songs PDF link annotation
    • http://jeratojovu.66ghz.com/biogenic_origin_of_petroleum.pdfIn PDF document text
    • http://galajanexagaj.iblogger.org/jawbone_up24_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_6019c08113d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5fe63715e4ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_603104e254973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_601d5b8c578e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_6031c1c0817d1.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/jabafe.pdfIn PDF document text
    • https://vikabedegopeve.weebly.com/uploads/1/3/0/8/130874339/ziseme.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/legodobagabuzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5ffe4a2068d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5fc9071e24782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_603196992523b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601965ebd5692.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/9604818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_60051cdcaa506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fde9de02a02d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lexojowal.epizy.com/18807237084.pdfIn PDF document text
    • http://jajowisomipuw.epizy.com/bhojpuri_gana_2019_ka_ing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 4916 bytes
SHA-256: cfb4a282c061bd8834704b77319f81738736bf9ce34b3bf029feeefabdf7a3ff
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10668 bytes
SHA-256: 9c45df1dac05095cb953a4220e07930c625d085dda16532091e65e8da5511179
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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