Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b5560ebb0366e4…

MALICIOUS

PDF

80.1 KB Created: 2021-02-18 17:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 823b135d9bda71267d0c689aaacdad6b SHA-1: 0b08b9c7e871fc4232ffea01bee74fe99c8cdf0c SHA-256: 35b5560ebb0366e427cdc16e9fa454492c7b7933a60f175b2147f5c17f0c4689
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF hosting sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

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://leonvi.ru/aws?utm_term=how+to+best+study+for+cfa+level+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369932/normal_602187eee8d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_6020933774b17.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/xOjbgLj/55630017278.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/4Rhjjex/city_racing_lite_mod_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/BGoE8hi/zabovilirowafebisujuvigim.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/2591007.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/71397.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/idhiPig/ncert_books_solutions_supercop_education.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_6027b935d747d.pdfIn PDF document text
    • https://magifoxokepo.weebly.com/uploads/1/3/6/0/136053300/bisiwibibesijem-nilebidibuz-taganofol.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/ia2hgtP/4356982216.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/wizedumi/activator_ms_office_2010_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/65115576076.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/acca_f6_bpp_text.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/80479084942.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/acc_aha_guidelines_heart_failure_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/what_are_norms_and_values.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/fax_cover_sheet_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/wgu_math_readiness_assessment_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5424 bytes
SHA-256: 58e946dde1a4c2ed4604ecccebf96ba4a7b3e6fa3c23a232ffa6835e07e6a7c4
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10872 bytes
SHA-256: 11c4ed76c3ed60c12337fa5b23d979026b232b8337afabde222113bb07fd0f0a

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