Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7d37cb1a051adf…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 14:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f95203ba762a128726964fb5f3869d3 SHA-1: 5c728788d4d5e8f9ce7063aec3ee45381af28064 SHA-256: 3b7d37cb1a051adf07fb8c2fff25701f70ef88c87e42f1b2cc247505e710f13e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=first+semester+chemistry+exam+review+packet+answers PDF link annotation
    • http://begdas.fun/kivolikasoloneg6vw2u.pdfIn PDF document text
    • http://smcjd.com/hyphen_and_dash_worksheets_with_answerst3tal.pdfIn PDF document text
    • http://vclean-sale.shop/nilovadodub4nbw.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/58441206912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_604fbcdbc2f17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ff0edea5cc32.pdfIn PDF document text
    • http://5-euro.info/ms_7778_ver_1.0_driversnmkuo.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/30661823789.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/21277361450.pdfIn PDF document text
    • http://furniture21.online/810357044890lsg6.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/41973736874.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/anglo_american_literature_book.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/20756015326.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/29310798725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susabumo.atwebpages.com/1546786461.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_98e850397ef1486d957a566ebf72a599.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/classical_neoclassical_and_modern_theories_of_organizational_structure.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/robinson_crusoe_malayalam_book.pdfIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_528e94cf36fd4000a550555e640c36b8.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 5484 bytes
SHA-256: b5f21f26c0b5384d389201dbf2b2ef64c8cb2f06e91e1ab090c1476a312a9a76
font_02_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 11180 bytes
SHA-256: 1f94a07bfbe53ced51eaa91e3c0dfe44589ac9429ec93f203a4048084717f90c

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