Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e03625b729589af…

MALICIOUS

PDF

70.4 KB Created: 2021-02-05 09:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 810276ad99e29009f5d4eb64db47ad79 SHA-1: 50e8162f6d374df7aa86487195aaf96a7eb6724b SHA-256: 7e03625b729589af6a40213b59320e00c132ecd05df2a8c2621393a546e05b9a
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Clauses and phrases practice worksheets'. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=clauses%20and%20phrases%20practice%20worksheets In PDF document text
    • https://cdn.sqhk.co/xizubutagen/gKP7gga/entry_level_marketing_coordinator_jobs_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_60028cf2d7efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_60192144dcf12.pdfIn PDF document text
    • http://vamoktin.ru/kusolojosigelufuvu6y74m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_5fe8b707a67a5.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/OjiYhjY/microsoft_document_translator_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fde1c658c78c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fffa223259df.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/ibhahdk/nigawufafesef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_5fd61a19480df.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/fxrbTy7/voviwadapaj.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://nitovotiroxe.epizy.com/depeche_mode_enjoy_the_silence_piano_sheet.pdfIn PDF document text
    • http://kebanibaru.epizy.com/19312093487.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/18582646186.pdfIn PDF document text
    • http://vedebimefawimad.rf.gd/95076748714.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/bajrang_dal_hanuman_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/77360980920.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/laxuxiwuxeb.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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 5220 bytes
SHA-256: e90af8b8ebecb2cb1700ae8dc7ebc6e4710cfcaab6f3fcfe00f4f59213137c7b
font_01_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 10016 bytes
SHA-256: fdc51470842250f8ea52e76ce10d4930e694f14be36816e0e9a433cec9c52426
font_02_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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