Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cc76f45ab4d2d0…

MALICIOUS

PDF

70.0 KB Created: 2021-03-27 16:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b576b3d8fc7f67ada9563722877de19 SHA-1: 24d5d7f94da74e0bcc2eecfa732d38b1fa7d3f07 SHA-256: 00cc76f45ab4d2d0d6c830993fc624e5452269741829747c0d58cddc0212626a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=bilge+oil+water+separator+project+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414500/normal_60394c9b3b711.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/gwFxTjd/park_it_on_market.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6024326c20983.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/bicHhfW/66093979967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_6053a59bc444a.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/bitemexilili.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/nidizulom.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/tazaxa.pdfIn PDF document text
    • https://woxatawupipop.weebly.com/uploads/1/3/4/0/134016674/nufugibozegu_bozek_makenatabube_widebiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jinavefajevo/hHibNh3/45768433189.pdfIn PDF document text
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/beniw_nexatosop_pogomefajuloles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_6048ed7f7822c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd6613327b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd66e4b7b31a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ffe53bc1a1d6.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/zubupupadovoxuxuxugopuda.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ewZieIz/metal_shooting_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/ejbggrK/hollywood_movies_2019_tamilrockers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/how_to_work_out_net_income_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c894af48-7396-4122-944f-e1c6b1365cc3/what_8th_graders_need_to_know.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71b63d8-c6dd-46a3-a2c8-638286b1933b/97657152300.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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 5540 bytes
SHA-256: f8fe1d8339639ed665aa0253e1b93e6df23ca02e4a2a20531f2375cc32b409ec
font_01_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10292 bytes
SHA-256: 6dfaacf9d69c4fe480b0e1e089c771ad5bdb552fce4d5ee6bdb6ec7cf86835fb