Malicious PDF — malware analysis report

Static analysis result for SHA-256 092a43da195019a9…

MALICIOUS

PDF

102.0 KB Created: 2021-05-31 20:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7651b3d11b94b3818e017ef92c4efa78 SHA-1: 4376dfe88b6e7ad9c51d6e14a7f409e1dd6ba724 SHA-256: 092a43da195019a92e86a2d73bd225e91a41d50a9e5507f200b8a8967fdbf3bc
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 0.8598

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://catamma.ru/pbw?utm_term=power+system+analysis+and+design+4th+edition+solution+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6012b1e447824.pdfIn PDF document text
    • https://tatefelerer.weebly.com/uploads/1/3/5/9/135966089/9669323.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/5118302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_6049955aa4f8a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487935/normal_60b4797586196.pdfIn PDF document text
    • https://dusuganot.weebly.com/uploads/1/3/4/3/134358603/836fa58558a22d2.pdfIn PDF document text
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/xozakotivujoboje.pdfIn PDF document text
    • https://xajovulunama.weebly.com/uploads/1/3/4/0/134096198/pomepakufedudo.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/4228889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_6014d9d1df115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_606159172cf76.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/kifipa_kikijobut_ritenutukeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_601b328ed15e9.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/8910175.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379744/normal_60b2599502299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144412566/bijevuxazusedijurinifow.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/86301481327.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/riwuvafafirepo.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144415362/45084523708.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144414552/education_needed_to_become_an_operations_research_analyst.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144413598/hum_aapke_hain_kaun_mp3_song_download.pdfIn 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_off00015643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15643 5736 bytes
SHA-256: 7e68e2c45a5b7a4141de8744092e7a6b27a1862ad7c393eb068538bfc8904ce1
font_01_sfnt_off000169c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C2 2672 bytes
SHA-256: 0b438d1471fa6d611526411c8f435c8d80d6bb92b86c5bed4328b2d6ee21158e

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