Malicious PDF — malware analysis report

Static analysis result for SHA-256 238d081e72c861c1…

MALICIOUS

PDF

109.6 KB Created: 2021-03-29 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37cde6d5f1472219f8c7a28365d2b09d SHA-1: 51ac7d8b9a736d85f622dbb5511b5b2b1074ba95 SHA-256: 238d081e72c861c17e3fecb602df20ccda954624e99d9dc962837f7305b069ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://maypoin.ru/wix?keyword=mary+poppins+book+pdf+chapter+2 PDF link annotation
    • http://harmony-market.ru/bofejanukukogawyo278.pdfIn PDF document text
    • http://jiwujat.iblogger.org/8229562338.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/5th_wave_movie_actors.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/ggiegiP/gst_status_cancelled_suo-_moto.pdfIn PDF document text
    • http://keepmaxi.space/what_is_news_article_all_aboutsyo32.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ibx6h3d/gebimabuvonogututi.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/g3fhxhc/65335993208.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/xafevizusidotame.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/vamuxopepuruwogutu.pdfIn PDF document text
    • http://dalkomis.website/antebellum_education_reform_goalsxm2w1.pdfIn PDF document text
    • http://retibojebefav.22web.org/2221736447.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/6f57d9b2-df0b-4855-83e9-8dae837ec4e2/lenovo_thinkpad_t420_wifi_drivers_for_windows_7_32_bit.pdfIn PDF document text
    • http://garorores.rf.gd/29103154876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deea96fe-25fd-47a2-ac0f-c7dbb55087fc/autocad_free_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d301f6-0782-423e-954d-ace7057e45d4/jebodugifodegutus.pdfIn PDF document text
    • http://bejilelik.rf.gd/88639196442.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/20371306763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f24ee1-e598-40d6-9d52-81b301b3c7a0/frozen_coffee_at_dunkin_donuts_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1abec29-a470-4467-8dc1-e5222ab0611d/sebirupelijevasatu.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_off00016be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE2 5656 bytes
SHA-256: 9df42c1d6848bb2a9b7d8c3fbc2c8a0d63069f9c66aebc89128de583e0a069da
font_01_sfnt_off00017f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F33 12988 bytes
SHA-256: 7801d3988ae286c95b7ea072f193d2e21264e1ea5d95ea5eda770c7ddaa1cf29

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