Malicious PDF — malware analysis report

Static analysis result for SHA-256 8128424305fd7561…

MALICIOUS

PDF

68.1 KB Created: 2021-01-15 00:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e89adb4eb925d46153d2bdb0efe304fa SHA-1: 3af1cd497e3fd69cfc462d0517ccec24bff3f027 SHA-256: 8128424305fd75617326f3fa403f7daf76c3e3bd634c72a17afb30fc65e582e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains multiple external links, with one specifically identified as a credential phishing lure impersonating Apple and redirecting through a disposable domain. The document body, though heavily obfuscated, suggests a lure related to 'Marine biodiversity activity worksheet whale evolution'. No scripts were extracted from this sample.

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/9209364.pdf.
  • 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://trafffe.ru/aws?utm_term=marine+biodiversity+activity+worksheet%25E2%2580%2594+whale+evolution PDF link annotation
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/9209364.pdfIn PDF document text
    • https://site-1173507.mozfiles.com/files/1173507/gisagokusepujijidu.pdfIn PDF document text
    • https://site-1211292.mozfiles.com/files/1211292/jedatipukoxu.pdfIn PDF document text
    • https://site-1175227.mozfiles.com/files/1175227/minokeguximosoxizoribin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fdd68418d7b8.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/iggjtge/7089040979.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/35919199516.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/lvZ01ia/wabojatedewevupodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fa40b2b8f7ba.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/belopudevuzuza/basic_accounting_rules_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/jarun.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/sideload_launcher_2_apk_download.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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 5520 bytes
SHA-256: edb06b461743919870bc1e1416be28db207fb1a14e91bd288b0dd4abd15d243e
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 9784 bytes
SHA-256: be8ebb013ee041dfe76c9a0de51fca2a306960012ed2360840ecbedbf962dfd7

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