Malicious PDF — malware analysis report

Static analysis result for SHA-256 4458ea7ace839ab8…

MALICIOUS

PDF

76.5 KB Created: 2021-04-26 13:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aa449489b1514fa0583ee0393d19846 SHA-1: ad3704487e04dbb93f8c28d1d6ccf3a44e7683d2 SHA-256: 4458ea7ace839ab84625bffab6edb28e9ba93e0a70d54a13292789b3a90fbb25
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, with one prominent URL pointing to 'jacksth.ru'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

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://jacksth.ru/strik?utm_term=honda+civic+2006+coupe
    • http://kinoxca.xyz/nebovapuxisaf7tcn6.pdf
    • http://bristol-yalta.run/haunted_house_1_full_movien53h7.pdf
    • http://kostlike.site/wheel_of_fortune_pc_game_10zk9u.pdf
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/xesomererujavux_zatesanorukisij_sufisamu.pdf
    • https://sozikusek.weebly.com/uploads/1/3/4/3/134333331/6381905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cfd32d58-bd59-4c82-99b7-86b708ac954d/rivivevizuti.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_959c68fe3b914fbda50c5232236f2182.pdf?index=true
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_fa6373af6a6544b79d52c20caa995f1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07104953-1270-4263-8458-13d3c09751ae/wunome.pdf
    • https://s3.amazonaws.com/xasovewipeje/airtel_mobile_tv_live.pdf
    • https://uploads.strikinglycdn.com/files/06ef008a-1e1d-4e1e-8e98-d3936987e1d1/what_is_the_function_of_coefficients_in_a_chemical_equation.pdf
    • https://uploads.strikinglycdn.com/files/7e7dd402-ce85-4b60-9ec2-f227ef701503/how_do_you_change_the_battery_in_a_garmin_s2_watch.pdf
    • https://s3.amazonaws.com/lanaladu/bededixisofidekagotimiruw.pdf
    • https://s3.amazonaws.com/vuraradaso/advantages_and_disadvantages_of_technology_essay.pdf
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_ff186315ff81465e8ddbee133a5d70bc.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/panelview_1000e_download.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_4f5d0fc446ae48bf9d066333baa3838e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74f9f96e-0c8e-4c50-8b35-8edd21ef17ed/lipamozukejosogulapowo.pdf
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_df4e4548b2e2450d8cde97a602f98526.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_off0000ecdf.bin
8f6ddeb8761021f6b7ad84658ce681a84725bb25a0ff7aaf596d277a6d6d8060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 5212 bytes
font_01_sfnt_off0000feb0.bin
a8e2123cd7488a8a5a5e43dcce1c1a950ff09dd6ffafc7c35a2b5b90ec6c15db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 11296 bytes

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