Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1924a8a23fd384…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 22:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8bfd1788d1057a617a21d1d1e4a12f9 SHA-1: 7c70100963396941bf19d265045ea42c85ca939b SHA-256: 4b1924a8a23fd3840f5c016d3132aeb0afe0a43bc2f010df5e96ceb3abf17157
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent external URI, 'https://mezovuduw.ru/wix?keyword=experiment+worksheet+template', is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojan payload. The ML classifier output of 0.999756 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=experiment+worksheet+template
    • https://cdn-cms.f-static.net/uploads/4475864/normal_6057098a02755.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_603739f69bcdc.pdf
    • https://cdn.sqhk.co/gugapedulob/fhdYjgN/vuxamusuz.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/zotajiro.pdf
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5ff0a98078120.pdf
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/2172479.pdf
    • https://cdn.sqhk.co/zedujunuwuxe/hjiXijC/anandamela_1424.pdf
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5fdd95010ad0b.pdf
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6058cf31822bc.pdf
    • https://cdn.sqhk.co/kekelivig/c7GgdEM/26985130976.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e23ade6e-c793-46c3-984b-ac064a401bef/rogezovafi.pdf
    • https://uploads.strikinglycdn.com/files/e3ce1b94-ca5a-4a05-877e-9bf214deddb8/sixodabenetorarafijogil.pdf
    • https://s3.amazonaws.com/wenobagupexekap/archicad_software_free_with_crack.pdf
    • https://uploads.strikinglycdn.com/files/bd6295e7-40a1-48a4-a82d-ea946a9cc251/firehouse_subs_hook_and_ladder_salad_nutrition_facts.pdf
    • https://uploads.strikinglycdn.com/files/d5e4d07d-6e09-4b6e-a2cd-102d72c321a8/the_maze_runner_2014_full_movie_dual_audio_download_720p.pdf
    • https://s3.amazonaws.com/levovod/vuwegajugukanopik.pdf
    • https://s3.amazonaws.com/siwixomudit/button_click_animation_android_studio.pdf
    • https://s3.amazonaws.com/lanorolowu/cv_template_for_lecturer_job.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c6.bin
30c7443ba66ed8fa83728e51c4cda08f392df777130b3a5fd4bd2f73f802d4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 5028 bytes
font_01_sfnt_off0000f7ba.bin
5c390f109c70d3e2835f6e3c26d60e3e0c88f81348ee9d5daac64c8d7293ecfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 9864 bytes
font_02_sfnt_off00011996.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 4324 bytes

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