Malicious PDF — malware analysis report

Static analysis result for SHA-256 841d8d4657233876…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 01:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e7f550587c3cc2077a4ddde5f3897dd SHA-1: 18307c72b24763a403d5f5bddeec59b70b0e5a81 SHA-256: 841d8d46572338768cf07453321c602f7d0cde1f95cd4c6107e944fd86790555
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with several pointing to disposable domains and exhibiting characteristics of a link farm. ClamAV and an ML classifier identified the file as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://gimoguvi.ru/strik?utm_term=covalent+bond+lewis+dot+structure+worksheet PDF link annotation
    • http://wefufivubulal.medianewsonline.com/89241089660.pdfIn PDF document text
    • http://indital.fun/lafaginokegorosalisaxonef5tsdj.pdfIn PDF document text
    • http://terugate.mypressonline.com/rosemary_baby_review_indonesia.pdfIn PDF document text
    • http://selectgetc.top/ball_drop_live_stream_2020_chicagomu1zx.pdfIn PDF document text
    • https://cdn.sqhk.co/gomalajipo/kYkjbgh/7440754108.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/fgffhgV/23955479550.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/employees_credit_union_phone_number.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/exercice_d_orthographe_cm1.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/19555156573.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/miseguv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1313dd-06f4-424e-b228-d95afe8b81d9/81146830880.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/75252600070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2eddaef-99d7-4a05-b41a-a8a825098172/quadratic_equation_solver_wolfram.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/medication_administration_error_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/45749276579.pdfIn PDF document text
    • http://xafibejijopo.atwebpages.com/fekubedafovaxavutefimebu.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/mathematics_2nd_year_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef93bad7-40ef-4256-9df8-378a3a841581/moca_test_interpretation.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 5288 bytes
SHA-256: 8058da55b8ba969a955c3cef588dda85d8a54f718758b89e213fe13adde05cf5
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 10816 bytes
SHA-256: e77bf20ce191754ce56510d8bb99c3dbf80e3956f74563a6d62a47707e0521bf

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