Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7c53e26cdfceaa…

MALICIOUS

PDF

76.8 KB Created: 2021-03-05 17:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 692c6a3dd4674907b0c05140e1db91a4 SHA-1: 2cf16aecaf77dc2d62acfa6cb98a519148e0aa87 SHA-256: bb7c53e26cdfceaa5a7d09726596140747b4675fdec7dd6cc6e8c20885f41088
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI and a high-severity heuristic firing indicating a redirector link used for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to job interview questions, aiming to trick users into clicking the malicious link.

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
  • 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://baarspo.ru/aws?utm_term=what+are+the+questions+asked+in+wipro+interview PDF link annotation
    • http://lirepenepubejix.iblogger.org/85368433299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_603f142d23f84.pdfIn PDF document text
    • http://liko-sneakers.com/hair_length_chartmtdtc.pdfIn PDF document text
    • http://remontnatali.ru/zoxuwukogonemavemanuf2a8dp.pdfIn PDF document text
    • http://sojekobab.22web.org/busimusoxeter.pdfIn PDF document text
    • http://7evenrp.ru/clave_pin_sin_applhhx6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5ff499ff71383.pdfIn PDF document text
    • http://online-bestshop.xyz/ejercicios_resueltos_funciones_del_lsp71l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_600a3fed32d57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigivixegaxun.epizy.com/yooka_laylee_impossible_lair_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/vufepisimo.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/22565284959.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/78107609391.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/aircraft_crash_reports_faa.pdfIn PDF document text
    • http://falufobi.epizy.com/interjection_worksheet_for_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/update_android_pie_s8.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/rateveji.pdfIn PDF document text
    • http://bijupota.epizy.com/somubipuk.pdfIn PDF document text
    • http://ziwibavufu.rf.gd/nylatron_specification_sheet.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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 5372 bytes
SHA-256: b1a6b98f58ae277d08e3ce958d40098cec97aac69ad3898e38f3f9786bbd2eec
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10604 bytes
SHA-256: 1a787994aca0d88da9947055af3b4b1c3830b7a051f58d88ea67f7037b945445

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