Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca10c0e5f8202ce7…

MALICIOUS

PDF

72.0 KB Created: 2021-06-14 03:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 29055138096e3e791c672baaf68ce228 SHA-1: ca591b3d57a3a6f3b0b308dbf05c0a33d418782f SHA-256: ca10c0e5f8202ce77b1ab1e2647810cd62a97f61f66f70d6d5e02bac8ca2741e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/pbw?utm_term=mersal+hd+video+songs+download PDF link annotation
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/fajiran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_60c5563349564.pdfIn PDF document text
    • https://xanojamazifedim.weebly.com/uploads/1/3/5/3/135323589/wefixewavama.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453332/normal_5fcd9e80722d4.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/06fee4917f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5ffa9e3d3c075.pdfIn PDF document text
    • https://silolezozuwagu.weebly.com/uploads/1/3/0/7/130774999/vexunevizomivonazu.pdfIn PDF document text
    • https://dabekigojevuj.weebly.com/uploads/1/3/4/6/134636423/1238673.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/vakuronaguj.pdfIn PDF document text
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/3a29d827d4f8ca.pdfIn PDF document text
    • https://kepevexin.weebly.com/uploads/1/3/4/2/134234606/9905523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffb28c88f1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_6020c8534aed9.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/dafae1261.pdfIn PDF document text
    • https://denumojadiribik.weebly.com/uploads/1/3/4/0/134042792/gudufasudakavub.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/namuwutarudid.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/6897630.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/siramopiniroxov_kenofose_nalapomowejol.pdfIn PDF document text
    • https://nagofojog.weebly.com/uploads/1/3/4/5/134586362/vosama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419148/nuwawujubibokokedadekuf.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144474537/23672124994.pdfIn PDF document text
    • http://xozojonurom.pbworks.com/f/arcgis_10.7_manual.pdfIn PDF document text
    • http://xiwesamoneni.pbworks.com/w/file/fetch/144885435/64422000260.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/145117908/f2_full_movie_in_telugu_free_download_jio_rockers.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 5244 bytes
SHA-256: 4e0f5fd22f8765370c6627d96d073b50245cae74e65881fef9ca64659c2f2b1c
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 11148 bytes
SHA-256: 839aacf66fe45baf3deb6519fefb3ce94809fb410751d857f82b972cae65636d