Malicious PDF — malware analysis report

Static analysis result for SHA-256 4898ce00f49b5885…

MALICIOUS

PDF

68.7 KB Created: 2021-02-11 15:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: dce14be442c4ff96b437fc741b7eb153 SHA-1: f489103570c5ceabe503a84813fc81e1c44c598c SHA-256: 4898ce00f49b58853d36bcbfb2e47a6c6412f1479ffdb1974e5628d6386fe925
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=brooklyn+college+spring+2020+start PDF link annotation
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/dikiwonolol.pdfIn PDF document text
    • http://jefozogez.66ghz.com/92998357622.pdfIn PDF document text
    • http://bopafunimuvuka.iblogger.org/cohort_plc_annual_report_2018.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/mivokozibu/bhoot_fm_1st_episode_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/cornucopia_clipart_template.pdfIn PDF document text
    • http://wifepex.rf.gd/css_external_style_sheet_not_working.pdfIn PDF document text
    • http://votofeki.epizy.com/ipcc_auditing_standards_notes.pdfIn PDF document text
    • http://vofimefokugof.epizy.com/hiragana_character_practice_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/50848932385.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/exploiter_orb_guide.pdfIn PDF document text
    • http://dudakesiburegig.rf.gd/vespa_primavera_2018_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/kemelowi.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_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 5588 bytes
SHA-256: a6eb182c3c6d008d238608754c24442dc9f7e2a810e7728bc43c6797b84d1446
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 10424 bytes
SHA-256: 76d522cd6844f862296221d3adf594cd434cefa7887fe2104ffc5394544367eb