Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc91db738fc0dc…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 02:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3db140da5b37bab87371b1a92cc3b92b SHA-1: df71504c702b469bc3dfc0d0ebcba5655f038d83 SHA-256: 43dc91db738fc0dc8ca96499d3a5eaa093f138e99223ec71af0dd059cce65a00
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, including one that appears to be a search result lure for 'laws of human nature pdf'. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=laws+of+human+nature+pdf PDF link annotation
    • http://kopolade.22web.org/15376853119.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/gfEu9ys/wozuriwasakuzupazupotusu.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/iLWohgB/80509463560.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/21955491439.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/Fggluky/voice_changer_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/XiyeHAp/the_king_of_fighters_97_platforms.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/ihjhugf/screen_recorder_for_windows_with_audio_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/eH8ouDO/defibidorarar.pdfIn PDF document text
    • http://xazapefunel.getenjoyment.net/objectives_of_aggregate_planning.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/nefunupu/yahoo_finance_mobile_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/jumuguxa.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/76229856324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb5cbf3-12b3-46b2-8734-77d1387cfa64/diagrama_de_equilibrio_de_fases_ternario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0c9a7c-890c-4aad-8182-86b982b72371/the_ministers_black_veil_summary_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/biomedical_informatics_university_of_pittsburgh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e979ab-1419-4d71-8fae-be71bf6d09d8/jadajumiwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d240ed4-fccf-4cfa-9a4f-d7cb3fa068c5/7651425008.pdfIn PDF document text
    • http://kedokonox.rf.gd/40597937346.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/date_sheet_du_sol_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/aquacultura_em_mocambique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bd25ff-3514-43af-8908-730e72c76f72/planet_fitness_advertising.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_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 5280 bytes
SHA-256: d03e20e31394d72605bf5c9ff2118bb261154865de1493a3eeebd0354903f707
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 11148 bytes
SHA-256: 05f6210fcbceae6cb4b478efaf14f6e49d586833146b57213a4e340f68d8eb92

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