Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3b8b45cfee0a35…

MALICIOUS

PDF

84.5 KB Created: 2021-03-18 14:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008b7411e2753639df7084d78728bc63 SHA-1: 718907b6ff8115e30464b261b97c2bc02acef1b6 SHA-256: 3c3b8b45cfee0a3592bc33e5f769a67d1feb5086739a6c5419cb6a101b570f35
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive users into clicking links, likely for malicious purposes such as downloading further payloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=angielski+biznesowy+s%25C5%2582%25C3%25B3wka+pdf
    • https://cdn.sqhk.co/desixurate/hxxlxjg/chicken_dum_biryani_recipe_video.pdf
    • https://cdn.sqhk.co/sezepemanu/jgSiinR/german_panzer_aces_ww2.pdf
    • https://cdn.sqhk.co/koluvukirate/jbDagj8/doruzagapamaxadonokesepot.pdf
    • https://static.s123-cdn-static.com/uploads/4447278/normal_6000505103b70.pdf
    • https://static.s123-cdn-static.com/uploads/4366980/normal_60036beec1133.pdf
    • https://cdn.sqhk.co/fikalibumi/cyxihji/71936409542.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd11d6338b92.pdf
    • http://xiwakaravivomik.scienceontheweb.net/grocery_store_shopping_list.pdf
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fe1b3678cd04.pdf
    • http://nageramuvepom.mywebcommunity.org/5517861460.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_da39fd2843e84940a8828f5ce776a285.pdf?index=true
    • https://s3.amazonaws.com/naxizugenabi/software_as_built_documentation_template.pdf
    • http://nodikaduf.onlinewebshop.net/89819549193.pdf
    • https://uploads.strikinglycdn.com/files/8361cbc3-b7f4-4424-a203-eeae21714585/vovar.pdf
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_5c95f07d6d224a01bbbbedb918e497fd.pdf?index=true
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_e042e7175c604b5999604aaf7e901cae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39fa1b8a-2a40-4ffb-b68f-02a9e4fa7386/the_hobbit_an_unexpected_journey_movie_download_in_dual_audio_720p.pdf
    • https://s3.amazonaws.com/gudukupir/nitrogen_cycle_worksheet_7th_grade.pdf
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_e5035651aa834cbf8e311c00c9797f33.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f690.bin
ab64459f9691a72ed204a99ec290cde0f841bfe51e9bd9e39e3e5f5cdd240bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 5448 bytes
font_01_sfnt_off00010901.bin
d66d1659f695e7401f17008e9b46267e09bca6775bfa812ee042043bbd3fa9a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 13912 bytes
font_02_sfnt_off00013489.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13489 4324 bytes

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