Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31a6f4253b8e6af…

MALICIOUS

PDF

66.8 KB Created: 2021-03-06 15:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f47a75115ad963ece5a1a8ca493a023e SHA-1: ed6111ad5a02488a22611855df858e6a2331f025 SHA-256: d31a6f4253b8e6af2f62fcfe3e8d8d24bd5354b8d291e28968f434e3a722447b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful 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://jacksth.ru/wix?keyword=body+language+worksheet+tes PDF link annotation
    • http://fetesitomer.mygamesonline.org/physics_equations_of_motion_class_9_questions.pdfIn PDF document text
    • http://devicesprotectionforusers.site/transition_words_for_2nd_body_paragraph30jov.pdfIn PDF document text
    • http://iwhite.space/83154032703x7kqh.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/lewisitujojubelax.pdfIn PDF document text
    • http://new-leggins.site/imovie_tutorial_2020_deutsch6wxs7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_6012ce57440cd.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/nebeduredobusupusava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_5fe87e3ef236b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602e38f93197f.pdfIn PDF document text
    • http://idealslimitalia-official.site/lisurinifobago6szj9.pdfIn PDF document text
    • http://itdomen.fun/wobalovveltb.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/48d7b5fc-b38e-4d4b-ad4b-5768e73c28e2/ruger_lcp_drum_mag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b7a4c6-c2ab-4943-865f-4cbd22bbb0a6/48468660874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0c9601-11d7-48d4-80a7-85142dfb6dcd/scallion_pancake_recipe_freeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a471a6dc-53d5-4079-9e4a-9cb9b6ad930f/55360071881.pdfIn PDF document text
    • http://lefajiw.epizy.com/casio_g_zone_secret_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/xikavubo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/36862579208.pdfIn PDF document text
    • http://mikesivu.rf.gd/chrome_pc_windows_7_free.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_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 5396 bytes
SHA-256: 5e9fac5d10fcfbaf970b3aa9ce6244e16a176e36e770cf1aedd77ead8ed1bd10
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 10352 bytes
SHA-256: 2a893d6b629f49dcf18fcc76cd9b5a235801b35daf6940eb9b13645637f04411

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