Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd24d420c1c9a6d…

MALICIOUS

PDF

62.5 KB Created: 2021-06-13 01:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e3a8eaf83bea01a845ea275b8347814 SHA-1: 3ccecd2f4cc7d19e54ba913905e98b88d6971279 SHA-256: 4fd24d420c1c9a6da4da9d8eeea99c6b88090367de14e1baa1af1359fbc28cb9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.8467

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 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
  • 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://irlanc.ru/pbw?utm_term=adjective+adverb+pdf PDF link annotation
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/8035487.pdfIn PDF document text
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/lumuwopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_60c4853219e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_606a3c2febe34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_60115c47299a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5fe3dadf4b6eb.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/16eff78d423755.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/jiwedasadib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fccdc3daf45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_60693de7935e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fffe4e49c6a5.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/gogifebovixa_badodowodekibe_wiwunivexapad_laloros.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/f6464b62-08cf-4295-8acf-653e40474530/2007_chevy_impala_power_steering_pump_replacement_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b5f75b-3928-4959-aa8e-b679b6a48973/samsung_galaxy_grand_prime_sm-g530h_lollipop_update_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bae5ba5-41cc-4665-a2ec-e272c9038896/ronakeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00bbe1b3-0408-4ec1-b344-fcf8de071ec6/kafuriwuwadomugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f903fed-968d-4194-9e06-d62b445cd018/xosofopasadape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7a0210-b215-45a7-85f3-5a444fc4f1b0/how_to_use_moultrie_a5_game_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdfb216-1737-47d2-b17d-6f7611e0f660/81463185604.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 5204 bytes
SHA-256: 3924a413a89358077e0e09ef432e93f9a3d746ba87ebfc2997dd1e9107301973

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