Malicious PDF — malware analysis report

Static analysis result for SHA-256 1935f2fc68cab8f0…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 15:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bf347b857a9361a5b90593d17844137 SHA-1: 2385c204af79aad92cee92d0b790652a43951bbc SHA-256: 1935f2fc68cab8f0240afba5107a74b533187ebb4ff35668fd7f53dc37f14cb2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, with a primary malicious URL pointing to a site designed to appear as a search result for 'genetic algorithm matlab code pdf'. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=genetic+algorithm+matlab+code+pdf
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5ffefffdcc3cc.pdf
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde85e27ef8e.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_5fd0f1a34b310.pdf
    • https://cdn.sqhk.co/posogamumut/hcDFRhI/personal_assistant_app_features.pdf
    • https://cdn.sqhk.co/vumulevezuf/hfjgjdN/drag_racing_manager_mod_apk_ios.pdf
    • https://static.s123-cdn-static.com/uploads/4426830/normal_6004bdc2ca1f5.pdf
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fed019cc463b.pdf
    • http://nibakelenixezas.getenjoyment.net/how_to_fix_samsung_microwave_not_heating.pdf
    • http://xonitaj.mywebcommunity.org/whirlpool_gold_microwave_oven_combo_door_error.pdf
    • http://vekisonoloze.sportsontheweb.net/ansys_cfx_introduction.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_47208ab0217241abb06916fd7f388ba8.pdf?index=true
    • https://s3.amazonaws.com/kefefetafij/67850837334.pdf
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_873021d95a1c4b46827f3664fc5a8b78.pdf?index=true
    • https://s3.amazonaws.com/wiwuxot/nutrition_musculation.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_c9d555dff434403d80e195878f0dddc3.pdf?index=true
    • https://s3.amazonaws.com/farowug/rainbird_5000_sprinkler_head_not_rotating.pdf
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_93679bae0de6457c98da67a14205d92a.pdf?index=true
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_279fdf8258dc40e0a46e3c7bb0f92672.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_cdf885cae1834f7ebeb385ce4b74ea33.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_8ebac8e65adb4b36817bc9ce8a350749.pdf?index=true
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_224524f93b3c448a8d52b7523737fe5a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e772.bin
83bddc880f7dfa8aa515b3a6d16a08439018ff1cd23ead2f78deedeec1bec9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 5560 bytes
font_01_sfnt_off0000fa32.bin
d01e7e117341cd373aafb8592ededd3a2374ed8261032a75c039e9f49ef6a14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 11152 bytes

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