Malicious PDF — malware analysis report

Static analysis result for SHA-256 00145ff5b0d7835b…

MALICIOUS

PDF

84.2 KB Created: 2021-05-10 06:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7dbe5f84315f271af1b2246d1c175564 SHA-1: 43334c0eb93414ce63afaed1b1cf05b14539e6b1 SHA-256: 00145ff5b0d7835b9e2bb8ab1d38dda1e533d942884675d65dae31799e40dc98
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=is+hisense+a+4k+tv In PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/fanurugekuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fcf3e95a264f.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/71448048064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478687/normal_5fe4d6e8dc552.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tobugawamux_pesiv_givorixef_pogonolag.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/17233488362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5fe43e2f732a6.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/72fa90aa.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/5048216.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/gavebufiwaku-jedafefevoka-nifoxovazizepi-mafutezajefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_6066c2a970c76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ffb09ac21194.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/60845823041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/wemaxonan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603427df-b3f6-4641-bd9b-ff2c4b0ac5eb/is_6_figures_enough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df26261-39a2-408e-8c6f-d2c54aec3441/shimano_di2_problems_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/sigelei_150w_tc_box_mod.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/attestation_employeur_pour_pole_emploi.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/1432156274.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/dorian_gray_penny_dreadful_fanfiction.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 4472 bytes
SHA-256: 58a838b210ef02ed20e642ece9d655c3338f8baf9bbab09e921a54f49841fec3
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 10884 bytes
SHA-256: f986e35fc815771e76e89e00fbadb8116ec71e37ff21e449480e63627ccf1258
font_02_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378