Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa28984c9e18ac8…

MALICIOUS

PDF

69.8 KB Created: 2021-01-12 14:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 991d894c60757ed8f675ce2ac8e03421 SHA-1: 0b8e6b7f07e9e435800d6d65a13d5be9ec9a4b9d SHA-256: 8fa28984c9e18ac8993997359986ef0774ef63a08a18082b0df83153de4670e5
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting or link farms, suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffine.ru/aws?utm_term=free+insta+followers+app PDF link annotation
    • https://site-1173507.mozfiles.com/files/1173507/lethe_definition_en_francais.pdfIn PDF document text
    • https://pexegiwu.weebly.com/uploads/1/3/4/5/134526087/bubugoxagukudo_xigijib_teruwanarodot.pdfIn PDF document text
    • https://selimubujupaso.weebly.com/uploads/1/3/4/8/134847774/74176b6a624.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/rovatevobozukovibine.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/zedatape_figok_kifato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5f8ff946344bf.pdfIn PDF document text
    • https://site-1177630.mozfiles.com/files/1177630/uefa_champions_league_standings_barcelona.pdfIn PDF document text
    • https://wipibafupegivu.weebly.com/uploads/1/3/4/8/134868488/9473553.pdfIn PDF document text
    • https://site-1208467.mozfiles.com/files/1208467/cv_format_for_sales_job.pdfIn PDF document text
    • https://site-1178197.mozfiles.com/files/1178197/77993117974.pdfIn PDF document text
    • https://site-1178549.mozfiles.com/files/1178549/safakaloralavefal.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/nufomaxulapixel.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/bada95c2ecc.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/lepefi/95886974368.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/album_historia_natural_jet.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/discrete_mathematics_and_its_applications_7th_edition.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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 4940 bytes
SHA-256: ff09aa62da3d71b47ccd80a9a91b464521c81230890f81331e008c3053edd394
font_01_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 10424 bytes
SHA-256: 85a2c79583c444685dd33ff65eb03bc909b5dfca97de4a946a015ffa6f8a44aa