Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b8f6071cce71d7…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6513d6037cdcdbee2ac59a7f33f32b96 SHA-1: 198e3c07b3bc825745da080895617e68e4e42310 SHA-256: b9b8f6071cce71d7f131b57a683afcd1996dbab023e105179fc4264b16525abb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=best+budget+worksheet+excel PDF link annotation
    • https://cdn.sqhk.co/zowonefaso/gftgjW9/70483000884.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/1622662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6025fe148a883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_601266b228cb5.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/aTWifhb/tibirumutugatatetemibomik.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/geiiThg/51567775448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcd74c477c9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5ff926f430ca3.pdfIn PDF document text
    • https://mufiwejugoj.weebly.com/uploads/1/3/4/3/134340856/lufaredegilujaso.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/kavalukato/does_manifesting_a_person_work.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/rajomusafo.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/41177894228.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/frigidaire_washer_dryer_combo_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/olivier_blanchard_macroeconomia.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/innocent_witness_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/ct_trang_bng_foxit_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/nordstrom_men_s_dress_shirt_fit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/admob_developer_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/52897075997.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5404 bytes
SHA-256: 1e66358f2754513db392f66aa507186e8a13366885fead88029839cd9ce3afbb
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11744 bytes
SHA-256: c26063f98f96fd2312d16223350e919e6aab5af70ae646dd706335c6994e6895

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