Malicious PDF — malware analysis report

Static analysis result for SHA-256 459bf9c1cf4fd3e6…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 06:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 83632a87e1f9b951e8739b1b97841e2d SHA-1: ca2ec45803e7987557755aff5701469755a30da3 SHA-256: 459bf9c1cf4fd3e6203d4c9bf315c7f04c66b977d9f59f06edb583c3b4b7ad55
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it impersonates Apple for credential phishing and uses a link farm on disposable hosting, with a specific lure related to 'App store please review account information'. While no scripts were directly extracted, the PDF structure and associated URLs suggest it's designed to redirect users to malicious sites for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xikoroto.weebly.com/uploads/1/3/4/3/134338579/7150276.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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://midufefew.ru/123?utm_term=app+store+please+review+account+information PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366358/normal_5fd09a316e5da.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/34193651514.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/busimimaxutimavofitiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_604b106fa182c.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/salesforce_rest_api_documentation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_601a9d81b2220.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/pronostico_del_cancer_de_prostata.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/sensory_language_examples.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/nuxir.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/7150276.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/43206373593.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/54b08.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/lixuzo/98702569726.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/82736483888.pdfIn PDF document text
    • http://winimoviwimi.myartsonline.com/darafopugalegogomize.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/what_are_the_names_of_the_animals_in_fantastic_beasts.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/cfa_level_1_mock_exam_with_answers.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_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 5304 bytes
SHA-256: 2b383a6c2ae4b84cc7ebecdf912f8a4b33ab3725ac14d6c119ed5d08b7f2579a
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10948 bytes
SHA-256: 6c05637c4bbf649b0d86aeb6c68b9b4be335a56f7098422e4b8e1ca3427f4a77

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