Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb6760d17d4d89f…

MALICIOUS

PDF

72.9 KB Created: 2021-02-18 05:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 37e4e4e7b2c608edf6d91d6cf0a7ced6 SHA-1: 7bd4adfbe74adf683cf3a95c0830912925a25af0 SHA-256: 3eb6760d17d4d89f1729319b506fb1811335f1b9d8c692f14e38ad99cc59554e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to a network of sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=how+to+help+adhd+child+focus+without+medication PDF link annotation
    • http://prizinsta.site/wire_size_calculator_necdmhvy.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/5620867.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/gaxekenowipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_6015cbfa4c916.pdfIn PDF document text
    • http://natikolom.site/cancel_cbs_full_episodes_and_live_tvuxta1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5fe961e26f57d.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/dafejikofu.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/zulutenonofaberovuso.pdfIn PDF document text
    • http://lifeit.pro/zilikonuzoburewubble.pdfIn PDF document text
    • http://avto-document.site/tupiwukemibessk4g9.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/bididufatenaduf_tiwivuwivulow.pdfIn PDF document text
    • https://leponinidokawe.weebly.com/uploads/1/3/4/5/134502666/xaxabuximimozoda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ff2de08c0b64.pdfIn PDF document text
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/teziwumafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_600ff22125315.pdfIn PDF document text
    • http://likelid.xyz/25712744781uwrpq.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/wemaxe.pdfIn PDF document text
    • http://how2clever.com/element_tv_problems_with_soundzucx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pilazi/zewukuzikanegoginemiw.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/knowledge_matters_sponsorships_reading_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/raxibox.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 5352 bytes
SHA-256: f6a0ea333ffdb49c11b1a54ec10e419d519e89752b76685e517db2444178dfd3
font_01_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10096 bytes
SHA-256: a2bd672ccc1af07eb7e47891e285d62dc9083ebfbcae996f236106f270efab3c