Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c62435bd99eb0f…

MALICIOUS

PDF

76.1 KB Created: 2021-03-03 15:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e0e1a65ba9454d038160f21abb6604eb SHA-1: 03668e8e8bff842680426c245cde4ee28cffc0c3 SHA-256: 31c62435bd99eb0f5ede5026307fc3d00a00566fbb32933bb53737ca63aca91a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and configured as link farms, strongly suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious websites, likely for credential harvesting or malware distribution.

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://resalured.ru/strik?utm_term=libro+azul+del+padre+gobbi PDF link annotation
    • http://gratoraama.website/6173504546pn9yc.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/what_is_the_role_of_indigenous_knowledge_in_the_indigenous_science.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_6033760a0cfc6.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/28160560715kql4w.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/xakaperizipe.pdfIn PDF document text
    • http://axecheat6.xyz/62778040118bot2z.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/ritopopege.pdfIn PDF document text
    • http://car-test.pro/pararurutemilukizes3j1pu.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/how_do_you_share_a_video_on_facebook_story.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd309c9eb94f.pdfIn PDF document text
    • http://dk-inc.xyz/dexezabokilavag1k8bs.pdfIn PDF document text
    • http://shmelev.pro/harga_hpl_taco_sheetcneed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/short_field_trip_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/hyaluronic_acid_gel_sheet_mask.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/12695703097.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/are_schwinn_spin_bikes_good.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5080 bytes
SHA-256: 2a4ffaccd2a117bf6b55b00f498c5ffca79b97fc0876391291800ba482faa877
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 12708 bytes
SHA-256: 07fc688cadf679b3ec76638d6f698f90500b9cae1144c6fa64d2172444bd77d9

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