Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c83dfa0e2d12ce…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 21:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3ae17d2e4b04c60d7f84b2135037d64d SHA-1: e79be444e4a4b0e8018d16d19ee15afe4fa8d53a SHA-256: e5c83dfa0e2d12ce682761691ee9fc9616894c6a8eddfbd72c545d731ae765f0
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting services. This technique is commonly used to distribute phishing content or redirect users to sites hosting malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these 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://jumiwimov.ru/123?utm_term=seemingly+irrelevant+decisions+worksheet PDF link annotation
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/fozalazimuduf.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/4034024.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/62073250169.pdfIn PDF document text
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/wavovixovogewepawe.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/xugolexizelofu_rebupizufazu_rukivin.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/piano_sonata_no._23_in_f_minor_appassionata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385434/normal_5fce6a09cc03d.pdfIn PDF document text
    • https://repenakexo.weebly.com/uploads/1/3/4/6/134600143/fomoxu.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/xegabumikoxeb-nujedidisitenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fec08bb5709a.pdfIn PDF document text
    • https://nobenala.weebly.com/uploads/1/3/4/3/134348336/f71ba7d46e.pdfIn PDF document text
    • https://tewodofupizalo.weebly.com/uploads/1/3/1/4/131452753/faveren_sojodefezuwo.pdfIn PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/e0498ac.pdfIn PDF document text
    • https://nigapabibaba.weebly.com/uploads/1/3/4/9/134903053/sigixebifudididut.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/sukedil/64943236246.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_ef802de9cced44c9a2e0859f934a9c7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/zufejaxepo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/spotify_free_premium_apk_pc.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_ca70c74eabf646fa9386d2b7296ec111.pdf?index=trueIn PDF document text
    • http://nixomirorubu.myartsonline.com/pesizafapaditutawatamaboz.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5772 bytes
SHA-256: c673fea280144387603ad692c15ce84e6f107292abb92c0f9c666d324745d0cb
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10748 bytes
SHA-256: ea5d3622fbbb09647f758f6fa440c96a3c3db21c346931c36cba05fd23b19a33

Open this report in the interactive analyzer, or submit your own file for analysis.