Malicious PDF — malware analysis report

Static analysis result for SHA-256 387f3faf0faa2fbc…

MALICIOUS

PDF

83.3 KB Created: 2021-05-11 06:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52033ac494ad7b5d63e0af652563098b SHA-1: 9fd1a702a0d1ca78d3e7a4801fc15fd5b5007949 SHA-256: 387f3faf0faa2fbc92cab7d29ffa33a4721d1be5d5413d5c03521d4cbd41c7f3
186 Risk Score

Malware Insights

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

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 0.9991

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://dugedepap.ru/strik?utm_term=evod+battery+blinking+red PDF link annotation
    • http://lonotel.mygamesonline.org/o_ceticismo_da_f_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_605c76b94896c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_600ef9d44add2.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/2f8f35c37bdf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5ffd0cf8d0892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_605f656743507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ff8b26336a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_601b432b25602.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/43120000457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_606e35cd62a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_602d3fde58d73.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/topitufa-laxegubu-jewowebor.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/vocabulary_for_ielts_anneli_williams_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_602cabfd54e61.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/9199571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_faed97ed7e61426ca46d46a16ad5ab43.pdf?index=trueIn PDF document text
    • http://zilisidojaze.myartsonline.com/texto_descriptivo_ejemplo.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/social_psychology_11th_edition_myers.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/vasabapeluvofafurerej.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/astm_a1065.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_c6af03c44cae4586a9b560b44adee86d.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_92e10f19324a4c35943ae3240a844e95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezonijida/god_can_do_all_things_kjv.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_6ee0900e33b24134bc080ef8259b0330.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/zafexizidazimiwizix.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_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 5136 bytes
SHA-256: 339ac4c19c5d3703037193c59d2d9ea7e7a9fe7280f14ab11ca55edcdb64f8a9
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 11112 bytes
SHA-256: 8d1d1719dc1351ada4b93a3a3e976ebb700d1a9b6449fc099eea33e18fb402ce