Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce168a8e8d96fa9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 23:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 287b2ab2d62234c83e6b866f221d8eb1 SHA-1: 27dc185bc3682584ca9abfc3891e5fd5844fd9c2 SHA-256: dce168a8e8d96fa9258fdbb0560e1744d0f41dc38cccbd47a9460caa8f77ea29
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One specific URL, 'https://zajinet.ru/strik?utm_term=flaxseed+meal+recipes+for+toddlers', is flagged as external and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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://zajinet.ru/strik?utm_term=flaxseed+meal+recipes+for+toddlers
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5fee21571d7b7.pdf
    • http://tipografiyav.moscow/zesejofatutemokoborilagrx52.pdf
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5fdd669f3d24e.pdf
    • http://playmarket-online.com/lg_hbs_900_bluetooth_headset_resetqkq9p.pdf
    • https://cdn-cms.f-static.net/uploads/4367674/normal_604fc562b0465.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/widiku/sat_math_test_2019.pdf
    • http://mirepili.epizy.com/does_autofocus_work_in_manual_mode.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_98c16d97038746e8aefea631ea5759f4.pdf?index=true
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_9580cbf3ac8b4887ab0a063e2331333e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5887ef3-3b99-42d9-bcd5-959fe942939a/fipusuwifowugu.pdf
    • https://s3.amazonaws.com/dalava/nvidia_shield_android_tv_vs_apple_tv.pdf
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_901a6fbbcff442589355231e6a18db2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f16d324-b70d-4144-a257-cf049de4567a/what_will_replace_the_internal_combustion_engine.pdf
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_5191a6e64119441c80a725e302e6487d.pdf?index=true
    • http://javunaxonifuz.rf.gd/kaxevipojafuxewetobeladel.pdf
    • https://uploads.strikinglycdn.com/files/eedce0c0-7ed5-46d3-b144-40913b7132e5/dell_optiplex_7010_sff_intel_core_i5-3570.pdf
    • https://s3.amazonaws.com/topipovikapari/bibovazuwixaxuzotefa.pdf
    • https://s3.amazonaws.com/tokatefozude/xilonowadevoruzogiwenesi.pdf
    • https://uploads.strikinglycdn.com/files/e29def08-f712-492c-8892-4a77a9a88ff6/vishnu_sahasranamam_lyrics_in_kannada_with_meaning.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_off0000edb4.bin
e8fff38540a79a7c56edc551831ac538b9d89a3716a57cdae35a9542a0e425a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5324 bytes
font_01_sfnt_off0000ffc0.bin
171b96bbeee0d747cb6c01305b29527854cfb4e72aff5133d11b0f457cd39c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 10892 bytes

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