Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d1ebdf1b03be3d…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 02:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9e10a388c542f3b7f4306e4e3f24b48a SHA-1: 516eb90df1977bae1eba8f37c4e7e1eb7f4c31de SHA-256: f5d1ebdf1b03be3d68c5e55ebaf39c3397e8ec07e6fa0298465a33b0c1ecc1d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external URLs, many hosted on disposable domains, supports the attack pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=how+to+tattoo+books PDF link annotation
    • https://cdn.sqhk.co/pogezasamu/cgdyZjg/gamaforotazidekew.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/pbjeSji/pi_music_player_apk_android.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/47540940723.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/46d4f011ef6.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/html5_embed.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/9cee84734f67b5.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/abb88.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/hanna_arendt_la_condicion_humana.pdfIn PDF document text
    • https://xafadefuvabajil.weebly.com/uploads/1/3/0/7/130776308/2669628.pdfIn PDF document text
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/wozufakigaje.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/d3Ygjji/juventus_vs_novara_man_of_the_match.pdfIn PDF document text
    • https://kefonajivivuz.weebly.com/uploads/1/3/0/7/130776591/9cb7f7773a9de.pdfIn PDF document text
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/tanomosu.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/hacking_historical_ontology.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/madajib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/the_stars_are_coming_out_tonight_filming_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/anger_management_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/vegam.pdfIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_f897f0d3dc29436db4b012e93dc0b586.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_23353e22ad8644e8991205cfdb1d87a1.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_faf55b232b4a4d4489256036d5d268c4.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_7790b662168a41bc8008eec07afbf913.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 4808 bytes
SHA-256: 421a1c0a731b391023258ae5456daa5375fb90ecf6be7930d88f98e1654379a3
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 10816 bytes
SHA-256: 8cef9110442b4d34e8c265f81092b795e133e8e9ff45b4cfb82b5044fb14d197