Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cedf34b3a75b38…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 14:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9c1156af77ecc655ad6780a34c3d94a7 SHA-1: 95ffa3a56206213304634c6efbe5d44267eb2f11 SHA-256: b7cedf34b3a75b3863e249b622e58bfc1c01edaa2d47380f1276e97c9a49a868
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 0.9997

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://druttle.ru/wix?keyword=nespresso+user+manual+delonghi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471475/normal_603728381603e.pdfIn PDF document text
    • http://gareduli.22web.org/23352610892.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/bdfef93ace5908c.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/ijjijib/43710846082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_60036d7e6b2a6.pdfIn PDF document text
    • https://cdn.sqhk.co/degamuwubela/igidOjd/potion_explosion_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_6049c754dde07.pdfIn PDF document text
    • http://bewugexujiz.iblogger.org/arabic_bible_outreach_ministry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_602d2c1a76d4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fe1a3fd86ac2.pdfIn PDF document text
    • https://ditikoxariwifip.weebly.com/uploads/1/3/4/6/134636805/ab4e5.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/jutenojamega/google_chrome_for_redhat_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/organic_crib_sheets_green.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/lutibimiteku.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/formulas_volumenes_de_prismas.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/railway_maps_of_india.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/warriors_dont_cry_summary_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/nibizuzitijobaxole.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/vijay_kathi_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/jamivijukokow.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_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 5340 bytes
SHA-256: 8ec23dcc62ffbee0036b8d7ebd2453ec74e5579b336ad9632ec6e412e42cb153
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 10632 bytes
SHA-256: 6f18d33dbeda43a14027b8b8b897ba2386a4afb108dffc88112d8133c6b2e96f

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