Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1f16d7a3130c89…

MALICIOUS

PDF

73.3 KB Created: 2021-02-26 06:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1f4ba41d95e16274ecba302bbbb21d72 SHA-1: 53fbf9195dffe87f2542b22e777a67ea291e127e SHA-256: be1f16d7a3130c8998936137b2b2a0310553b91503a23f1ba43e17e06221037c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a tactic often used for SEO spam or to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence indicate a malicious document, likely intended to lead users to harmful content.

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://jottigo.ru/wix?keyword=delonghi+coffee+machine+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469626/normal_60290cb0c14e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_6012a1042566c.pdfIn PDF document text
    • http://lynciguest.com/day_care_inspection_reportsexbkp.pdfIn PDF document text
    • http://bighome.space/fovivukomipukeladqf2b.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/CggFgg2/8808590473.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/gihgIjc/free_word_search_games_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/baduvezemu/iihoLYi/maxukazodizonaxo.pdfIn PDF document text
    • http://paktum.pro/fear_and_loathing_in_las_vegas_bookcg00o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5ff50e5a26040.pdfIn PDF document text
    • https://cdn.sqhk.co/bafuberudod/ddlqRjg/toxeriroweza.pdfIn PDF document text
    • http://detonic-italy.website/pedigree_worksheet_biology_1_answersaibwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5fe6b5de14179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6024537e821ff.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
    • http://nulanajivokavos.rf.gd/block_story_hack_mod_apk.pdfIn PDF document text
    • http://pijedawometuzov.epizy.com/jakuzefoge.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/notawutifudelonimuvoweto.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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 5096 bytes
SHA-256: fe308c9b23e7034c070d8c68f41dbbdc35764c52b155080fc638f731b7933825
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 10256 bytes
SHA-256: 1b230c353d3ae7e115316db377529d0b3e938b1b545a3e55b7a4efbc74eae6de
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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