Malicious PDF — malware analysis report

Static analysis result for SHA-256 8553696fac7ce683…

MALICIOUS

PDF

71.4 KB Created: 2020-11-19 19:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 255abaca1be47c88fcd3253b8bc12ae1 SHA-1: 90f86b51a55cb93e547769f4958fc2d4f33dbd42 SHA-256: 8553696fac7ce6837e5733da5051af650151e0b268ea9ec36bb3627c8fe5364c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffnew.ru/strik?utm_term=mecanismo+diferencial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fa712a993be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f955317cb4e8.pdfIn PDF document text
    • https://mokogexikimowo.weebly.com/uploads/1/3/4/3/134321985/tugixisib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5fb52a656dbf7.pdfIn PDF document text
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/mamuwatukakewogafim.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/xomijomotozake.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/lamez_remomugotun_wokodivewozux.pdfIn PDF document text
    • https://birisudim.weebly.com/uploads/1/3/4/4/134467091/kofux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f50d1a7-8138-4d75-b123-f98cd61c4c60/giloxupexofakeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d4c530-4b4c-4e65-bf30-32b0bb23db8f/54766205793.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/cheshire_high_school_portal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b18e5dc-f1ab-4e37-94d1-eff9329d90ed/spalding_county_jail_commissary.pdfIn PDF document text
    • https://s3.amazonaws.com/nozazodivin/ap_human_geography_chapter_1_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440a7200-5656-45a8-b4aa-8b1dc6ffd682/para_que_se_usa_las_comillas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedc8e6f-79ce-4f82-ba34-4cab4a3a7077/bakegapodulil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 5304 bytes
SHA-256: 912ed9300593719c83baee5685c5be06e58d00ba229f13141ddfc3259363fa4e
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 10060 bytes
SHA-256: e721e47bd238235f648acc6cd34e06f8e23422c6058c66a6e9d1bcbdf9e5e7bd