Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8fe4253a73ffca…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 18:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d79244ecafa098b40fa70b2823703fcf SHA-1: 9ac768071babbf4009b190ddcdf26cb2b7a97b63 SHA-256: cc8fe4253a73ffca64fff8d234de2703b382522e637368df6d65e369732bd0ba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=how+to+improve+speaking+skills+in+public PDF link annotation
    • http://segway-wheelchair.ru/dichotomous_key_worksheet_answers_insects5hm6l.pdfIn PDF document text
    • http://momsmall.space/gi_sheet_gauge_chartqa84q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5ff91598104de.pdfIn PDF document text
    • http://trenolgia.buzz/940563594660go5n.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/tipofenarudezapavulemej.pdfIn PDF document text
    • http://mebelrostov.ru/what_is_1_1000_of_an_inchiqvhm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_5fcbf9b549a98.pdfIn PDF document text
    • http://cmbclientes.com/the_golfing_machine_3_imperativessgwjn.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/what_is_the_most_viewed_rock_song_on_youtube.pdfIn PDF document text
    • http://shop-profildoors.ru/408530276519c46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_603585e1881d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipomik.epizy.com/nomeso.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/ribapapixezexumumoluwezev.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/jajedewuwuwomanog.pdfIn PDF document text
    • http://jezawijevot.rf.gd/eb1_recommendation_letter_sample.pdfIn PDF document text
    • http://dinukafewu.epizy.com/what_is_a_2009_bmw_328i_worth.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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5572 bytes
SHA-256: 374b9e2a6287981fdb636bc1222f64345121c7b4db8202459ce6acb21504f546
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10196 bytes
SHA-256: 84efab4b97ba26152097f40120ad670eb01afd8b118cb0f0bb64b91fdf8bc0dd

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