Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c98afb06f8d7fb…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 06:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42ca5197c092ec8f42e6df49ba6cf1ba SHA-1: 75dcd24e02af3b700b135fe8bed936af158e48bb SHA-256: 97c98afb06f8d7fb291a3462fa8162332e2222d5093d675342074e6aa48518f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious websites. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as phishing or a trojan. The embedded URLs, such as 'https://soxebez.ru/award?keyword=adobe+reader+merge+pdf', are likely used to host or redirect to malicious content.

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-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://soxebez.ru/award?keyword=adobe+reader+merge+pdf
    • https://cdn-cms.f-static.net/uploads/4381973/normal_600cc5bc03ed1.pdf
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/tefudiba.pdf
    • https://cdn.sqhk.co/wixefawoz/fo8lhj0/xuganeki.pdf
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/kogudolexopizu-mizekakomekefo.pdf
    • https://cdn.sqhk.co/fifapupifig/ayicibI/star_traders_frontiers_apk_3._0._9_download.pdf
    • https://latovadavubu.weebly.com/uploads/1/3/4/7/134716683/6988658.pdf
    • https://cdn.sqhk.co/sovokeduseb/JON88hc/gaming_wallpapers_for_pc_1600x900.pdf
    • https://cdn.sqhk.co/dawajimet/aujMvjh/super_bomberman_r_new_characters.pdf
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60072d6e3d3ca.pdf
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/xunuv-vogul-davujitefola.pdf
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/wolubeludemazabad.pdf
    • https://cdn.sqhk.co/jidelugob/ahh5ghD/dungeon_nightmares_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fbc613ce-b501-4701-9c30-6a4a6be88d88/19854174988.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_bc1e310b892446f789a67bcea215c198.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_b68a80e81ac5435b851ddf3bd8bf26c0.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_8fd4a7ee21b64b16b6707ebb9b1716b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3419203d-f0e6-47c5-b52f-9d78f5afde0c/31042922534.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_off0000fa35.bin
75a87e974c7f7ec73cbb3ce7f6e53ebecfa525b94109654dcc0260318ddf6d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 5280 bytes
font_01_sfnt_off00010c13.bin
783da3ce3d522a499f3d169cb4eec4da409132100d9db58a01f4a4e8aea9fc16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 11164 bytes

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