Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57955219d969288…

MALICIOUS

PDF

83.3 KB Created: 2021-03-19 08:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed639fc783e135ee75aec56bdfc0a8f0 SHA-1: 9d5cd16bb159df643134753c5e6d8937333ba491 SHA-256: a57955219d969288ed6a3e4297d47fa9650d770f55409d4936332a8a9b57c68f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=reading+plus+answers+level+i+courageous+woman PDF link annotation
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/vuwetex-napubaxamukog-relogabedetapoj-julirovunekud.pdfIn PDF document text
    • http://vashastrahovka24.ru/fapomalukezofurikepejujiq8pjq.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/certificate_of_analysis_format.pdfIn PDF document text
    • https://luwumevawosa.weebly.com/uploads/1/3/5/3/135322316/wevuwa-duvixudopapolur-gisatopuliz.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/gedoxetaxidupevapamowe.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/2977442.pdfIn PDF document text
    • http://shoes-storie.club/celebrate_recovery_step_study_formatpd4kr.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/garixiginada.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/f83a26d6ffc.pdfIn PDF document text
    • https://fowemofuf.weebly.com/uploads/1/3/1/3/131379389/zeniba_pezononelaka_pujedimoja.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/jezuju.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/17658736270.pdfIn PDF document text
    • http://blancop.xyz/asus_m4a785-m_cpu_support_listpd6hc.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/5718105.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/9696537.pdfIn PDF document text
    • http://numulul.mygamesonline.org/30073227794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jarirotexab/platform_film_hd_full_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/debelum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83ae065-3a24-4e5d-86cd-367d1e49c1ca/dark_souls_board_game_house_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb88865c-3f5c-4d25-8454-f2b7abfbc4c9/30568193463.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 5352 bytes
SHA-256: e356d5794311806205e2556592340950aa464a5f06bbb4775f651a173248d2ce
font_01_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 10700 bytes
SHA-256: 55b8722401f648a2d01730c0703d9c07756511c6115185bb35aa94408c29a7d6
font_02_sfnt_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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