Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42b3fb225177d65…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 16:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f52a63614138c97cc6d351623b4d83f7 SHA-1: b107857e1226a26c5486b93cf27fa493f826ba96 SHA-256: b42b3fb225177d656b021e86fa7a2a92e6e715f491802e110e05b092cbaf29fb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://lozipotod.ru/strik?utm_term=dell+ax510%252Fax510pa+stereo+soundbar+speaker+system PDF link annotation
    • http://teachost.com/texopizujukapikufouu1xg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fc74ade605c9.pdfIn PDF document text
    • http://leree6.club/how_to_write_a_forensic_lab_reportgyhtd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5fffbf26a979a.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/zifafibizuniwuvitilas.pdfIn PDF document text
    • http://thecet.xyz/basic_instinct_300mb_movie2gmhr.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/30fed499c745bd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369504/normal_5fd0881071d5e.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/the_lottery_movie_1996_wiki.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/essential_mathematics_for_economic_analysis_pearson.pdfIn PDF document text
    • https://vuloxeresipagig.weebly.com/uploads/1/3/1/0/131070754/zokutufitaxixag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/novifamigot/65821080867.pdfIn PDF document text
    • http://fijorolur.myartsonline.com/singer_simple_3116_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/31037335437.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/akbar_owaisi_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/bimoreponumuvoxoga.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/lomapesezufomoguduz.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/wotudefu.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/75195060327.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 5664 bytes
SHA-256: 84d2f2f9c3bbe5efc9c59848897651e6bea2b2f88535159c94ce04ab37e7eb8b
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10356 bytes
SHA-256: 818f5db8a96e69f183d5ccd659c3ad63db08db4fb9c2b1680ecde4e16ffbc490
font_02_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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