Malicious PDF — malware analysis report

Static analysis result for SHA-256 4295561d9b36d4e3…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 04:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b1676daf596d813c141503804623b68 SHA-1: 4f3d96015dd79949aa6ba408f95720d9350e1b1c SHA-256: 4295561d9b36d4e333d60840b2a2b21ef93143bf2a9b44c62d8542cee6d11e0a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the heuristic firings point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=zorba+the+greek+dance+instructions
    • http://testersairf.xyz/wuvubikejevilokemupevxhw6.pdf
    • https://cdn.sqhk.co/woberimi/eijhdhf/pifon.pdf
    • https://cdn.sqhk.co/guzunilepin/OSjeL2j/lazuwadatepalo.pdf
    • https://cdn.sqhk.co/pujixefan/jpuhiie/50676477925.pdf
    • http://trenolgia.buzz/canon_mf_toolbox_softwarett5gj.pdf
    • http://dosijefa.mypressonline.com/fumos.pdf
    • http://lg-copyright.com/togudefixaxexv82jx.pdf
    • https://cdn.sqhk.co/nukusigemug/3HPy0gh/19701531875.pdf
    • http://mx50off.pro/guidelines_for_short_term_disability2ul5f.pdf
    • https://cdn.sqhk.co/jugomuzuteb/MOziijd/79470498363.pdf
    • http://zawugudumi.getenjoyment.net/sat_reasoning_test_preparation_books.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e3b0d349-7a60-411a-91f0-34edb2d2537e/32805934555.pdf
    • https://uploads.strikinglycdn.com/files/83ee0cb8-2969-489a-9918-eaa904c86a5b/hobart_mixer_parts_near_me.pdf
    • https://uploads.strikinglycdn.com/files/af76c3e6-09af-48c7-b62d-97347144b6b6/how_long_does_it_take_for_herbal_clean_ultra_eliminex_to_work.pdf
    • https://uploads.strikinglycdn.com/files/566593d5-e12c-4735-b382-fa4acef30666/why_is_my_softheat_heating_pad_blinking.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_4c7f9ace35a843abae25820d813b81d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b661e718-7f21-4c98-a9df-5e542f0d490a/nalobimefareporisugim.pdf
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_db6248c5b0f3449ba3f8ff085d2b57d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/343904cc-70d3-4932-b0ac-22805051419d/ccnp_route_300-101_lab_manual.pdf
    • https://uploads.strikinglycdn.com/files/5d666bae-8108-4b22-aa45-83497f103252/temamedudukifosi.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_93c571f33aaf4d2f90521f4e31258294.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fa257d3-9bd2-48d9-8b4d-506be682019c/nepagififadizuw.pdf
    • https://uploads.strikinglycdn.com/files/2b8a0a69-7af0-4df9-9195-ec852a715791/30341838731.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df67.bin
d8ad517aa7d077dad8ee7610f082cb86d06cbc09c5822150a987f3a6a53c2177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 5328 bytes
font_01_sfnt_off0000f17f.bin
c51fc8dead4d4bf03188cb6d182584e23c7df30a38e099b3bec77c67425000ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 10336 bytes

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