Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f83ecfda0584a6…

MALICIOUS

PDF

170.7 KB Created: 2021-03-16 22:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20f35a909008b50ec705866335a0f4c0 SHA-1: 9cd286196c397f6724780094019f6b07dbc8223f SHA-256: 82f83ecfda0584a6c269ae96d1e4cfe85a62536b8cb71a6187656bb27b8eafe7
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 0.9997

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://soxebez.ru/strik?utm_term=how+to+check+rashes+on+babies PDF link annotation
    • https://cdn.sqhk.co/genonitag/cgjEYhd/9595190778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5ff1c3265fa4e.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/SKtFjdK/zubenomeva.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/ifjejak/37481364419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454999/normal_5ff9c20db4afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_603587d344651.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/fake_medical_certificate.pdfIn PDF document text
    • https://lezezirurebox.weebly.com/uploads/1/3/5/9/135967023/rujitawenije_todanok_rojufo.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/90316265928.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/gjibuha/offline_gps_iphone_free.pdfIn PDF document text
    • https://fasanubuxa.weebly.com/uploads/1/3/4/7/134733786/74f33b4d3a.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/giigjfu/timbuk2_stack_cubes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fda2d3734731.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/eShdUhd/garelulimazupujuwote.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/xafusorik.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/c7jciiK/with_heroes_idle_rpg_mod_apk.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/calcium_metabolism_disorders.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/k2rcn02/21704244606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fe9883705ab8.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/dheVgf4/kizinojisinop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000260fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x260FB 5112 bytes
SHA-256: 92b078e77bb99ca9824c2c0055d0bce385617f32b57005ba22e89cb18f7f2024
font_01_sfnt_off00027268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27268 12012 bytes
SHA-256: d3d2084d5d2e1a9ce3fba0051105de0e3bf88f7678a99619074db0c7a24055d5

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