Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6b9b74c6f70bc3…

MALICIOUS

PDF

71.4 KB Created: 2021-03-28 02:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 680eb1ada6fd9af40eb22c7553f7ec06 SHA-1: 9e95af186ecdbda44ca47b8d218af4f10e18d4c0 SHA-256: 6a6b9b74c6f70bc3d8577a9d267f7defd0cf82e8bb34798ba3feeeff1a054f4b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/wix?keyword=identify+independent+and+dependent+variables+worksheet PDF link annotation
    • https://cdn.sqhk.co/pibepufas/0zymjg5/27150968018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_6031235156b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_6020a8863fdf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fca87a87723b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_5fdc41a9e265f.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/hhBhjgi/55169431459.pdfIn PDF document text
    • http://teenagetutor.online/aminia_ma131_manuali861b.pdfIn PDF document text
    • http://ipatovaalena.ru/rite_aid_blood_pressure_monitor_bp3ar1_manual7iawj.pdfIn PDF document text
    • https://luvumape.weebly.com/uploads/1/3/4/4/134438520/vudixodon_setiw_xukivala.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jahpdf4/41950086310.pdfIn PDF document text
    • http://vittorguxx.site/372198462763hfci.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/fa0dde5c49d824.pdfIn PDF document text
    • https://munuradon.weebly.com/uploads/1/3/1/8/131859370/zuviwevolomofesone.pdfIn PDF document text
    • https://pogiwubuwafax.weebly.com/uploads/1/3/0/7/130775808/subuwug.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/h5PZiiA/archero_new_talents_max_level.pdfIn PDF document text
    • http://copyrightnotices-form.com/suririxixegabikujosaki6bxl3.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/wegoredab.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/heZBDig/brainpad_arcade_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_f3ec5eda2a274249a3961588cdfbc8b5.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_1080e179bfb442b1adad5b32096d1bd7.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_4ace297fb50449f7b7c9c6909283cfac.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_50eb6c22500c4e139967636add86a23a.pdf?index=trueIn PDF document text
    • http://podekorutad.rf.gd/mamifabatisibil.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_5340d730809d41cd9669ba924b15a9ee.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 5312 bytes
SHA-256: 4fbd9c1ce9949348b831fdbac40189688e58132a282cb22e2e3377fd28f454fd
font_01_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 10084 bytes
SHA-256: 9a404c644481e91b5776d7ab2c5fa5ca55311049054439c9fa119cc320364d33
font_02_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e